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Norman Sperling
2625 Alcatraz Avenue #235
Berkeley, CA 94705-2702

cellphone 650 - 200 - 9211
eMail normsperling [at] gmail.com

Norm Sperling’s Great Science Trek: 2014

San Luis Obispo
Santa Barbara
Palm Springs
Death Valley
El Paso
Corpus Christi
Baton Rouge
Key West
Winter Star Party, Scout Key

MARCH 2014:
up the Eastern seaboard

APRIL 2014:
near I-40, I-30, and I-20 westbound

MAY 2014:
near US-101 northbound
May 17-18: Maker Faire, San Mateo
May 23-26: BayCon, Santa Clara

California till midJune

JUNE 2014:
Pacific Northwest

JULY 2014:
Western Canada, eastbound

AUGUST 2014:
near the US/Can border, westbound
August 22-on: UC Berkeley

Speaking engagements welcome!
2014 and 2015 itineraries will probably cross several times.


ET Isn't Phoning Us

© Norm Sperling, October 25, 2010

One of humanity's longest longings is to find life elsewhere in the Universe. The search has been somewhat respectable scientifically for more than 3 centuries. Does any other scientific topic have a longer track record for not finding what it seeks?

The oldest book I own is a 1695 discussion on the possibilities for life elsewhere: Conversations on the Plurality of Worlds by Bernard le Bovier de Fontenelle (1657-1757). It surveyed what was known about life, and what was known about conditions elsewhere, and noted where the 2 surveys found common ground.

Books on the same topic from the 1800s and 1900s take much the same reasonable approach, though they differ markedly as scientific understanding of life, and alien habitats, improved.

The Science changed about 1960, when radio astronomers began searching for ET's signals.

This is NOT what I taught them!

© Norman Sperling, December 24, 2015

My eyes are starting to uncross after grading 60 essay exams. Most responses were great. But a few messed up my head even worse than my eyes.

* Astronomers always dread a night sky will disrupt their view of the night sky.
* The sun’s declination is higher during the summer and lower during the winter ... which causes the sun to be in a different position that is off by a few days.
* Erosion, atmosphere and tectnonic motions give rise to impact craters.
* A meteorite hit the earth and caused the extinction of the solar system.
* The middle stuff which is the lighest or heaviest forms layers in the middle.
* Neutron stars are not very massive relative to their mass.
* I saw the Andromeda Galaxy and quite logically, a surplus amount of dark matter.
* Ellipticals stay in a spherical looking plane.
* Earth has a core ... Then there is the mandible.
* [Telescopes] must be over 1 mil degree to view in X-ray.
* The late-early bombardment
* Main sequence stars tend to stay towards the center of the galaxie simply because they spend the least time drifting.
* Everything inside the Solar System is blue shifted.
* Reflection nebula reflect the star’s light through from the other side.
* The area between the planet and star is always equal as the planet moves.
* Gravity is directly proportion to masses and inversely proportional to the square of the rate they travel.
* Living species such as planets and animals
* Saturn is located behind the Kieper belt that has the finest rings seen because it consit of asteriod and ice crystals of the past.
* Galeleo using reflectors in his telescoped helped see father objects, however they distored color so you could see the color of anything.
* Galeleo was a pioneer above most in his era, but his bigest acomplishment was finding Jupiter, which help save Voyager 2. The incident was that Jupiter has been discovered yet, but the scientist of Voyager 2 studied Galelio’s notes which Voyager found and kept going to where they found Saturn as well.

Great Book Sale

I'm moving into an RV and simply can't keep the library I've built over 50 years. (What I do next is described at www.everythingintheuniverse.com/node/76.)
* Thousands of books, mostly <$10.
* These are the best copies I ever got, the ones I kept for myself.
* Many scholarly, lots of popularizations at all levels.
* A few hundred are from the 1800s.
* Over 100 are autographed by their authors.
* Runs of many science periodicals.
* Posters.
* Miscellaneous clippings, brochures, pamphlets ...

Cash preferred. Checks and time-terms accepted from people I know, and people they vouch for personally. PayPal possible, but I'm not set up for credit cards.

11 AM to 4 PM
Saturday, August 11, 2012
413 Poinsettia Avenue, San Mateo, CA 94403
(enter left of the garage, through the courtyard)
near the Hillsdale exit off US-101
Landline: 650-573-7125 (expires about September 22)
Cell: 650-200-9211

Solar System
Celestial Mechanics
Historical astronomy
early NASA
and much, much more

Historical Astronomy
Histories of Science, and specific sciences
Heroes of Science

Earth Science
Science Fiction
Africana/Black Studies
and miscellaneous other interests

The family is also selling kids' bikes, a drum set, 1990 Ford van ($1990), and (closer to September 22) household furniture and stuff ... and then, of course, the house itself. I'll move about September 22, perhaps to Pittsburg, CA, for the fall, then Trek in the RV.

Why Mass Media Keep Running Horoscopes, and How That Shows You Who Not to Heed

Norman Sperling, BASIS, vol. 21, no. 4, October-December 2004, p6.

For many years – decades, now – I've criticized mass media for continuing to publish horoscopes. Scientists and skeptics have demonstrated repeatedly, scientifically, logically, persuasively, that those published horoscopes are junk. They're not valid. They mislead readers. They even influence some readers to act in ways that they otherwise wouldn't, and to that degree they harm their audience.

I've worked in several mass-communications media, including a daily newspaper in a big chain, a web-based general news outlet, an authoritative independent scientific magazine, and now an independent science humor magazine. Colleagues in other radio, television, and assorted media tell me what those are like. Outside of specifically-scientific media, neither scientific literacy nor scientific mindset prevail. The vast majority of media owners and employees don't know science, and don't care much about it. Neither science literacy, nor gullibility for pseudoscience, seems relevant for hiring or promotion. Anywhere that science is concerned, they literally don't know what they are doing.

Profit-Driven Corporate Media

Corporate owners are notorious for being driven by the near-term bottom line. They aren't far-sighted enough for the long run (by contrast, some family-owned newspapers count by generations, not quarters).

Some owners make it clear that their principal purpose is to make money. Rupert Murdoch obviously puts profit foremost throughout his empire, so his Fox outlets, for example, may place journalistic standards second (or lower), and scientific validity third (or lower), along their way to lowering cultural standards generally. When Murdoch retires, I hope his successors will prioritize for greater public responsibility.

It's almost as bad outside Murdoch's empire. Most local newspapers are parts of large chains, which achieve economies of scale by operating non-local factors by corporate dictum. The corporation picks the cartoons and non-news features to run, including the horoscope column. The local news staff gets to fill the "news hole" on each page, but has zero influence on anything else. They funnel their attention to what they can do something about. Most newspapers don't have a science writer, and simply copy Associated Press reports, though AP is depressingly careless. I know a science writer who professed to not know whether her newspaper even ran a horoscope because she never looked at the non-news pages ... in which their horoscope runs every day. Most readers don't distinguish the different sources of what that newspaper prints on different parts of different pages.

Editing from Ignorance

I don't know any science writers or science editors who favor running horoscopes. But none rise high enough to make grand corporate decisions. Most stay within their subject. They report to general-journalism veterans, who are usually knowledgeable about public affairs, but emphatically ignorant about nature. The general-news media I worked for published horoscopes, and I carped about that, but gently enough not to threaten my employment.

Those senior editors impose templates of ignorance on the science coverage. I once had to put all my science coverage through a senior editor who was utterly ignorant, who kept failing to understand anything significant, and kept directing me to irrelevancies.

Another senior editor declared that "all stories are people stories", thus crippling coverage of, for example, a comet hitting a planet. That's how reporting about that comet and that planet gets shunted aside for personality-pieces about whoever happened to discover things.

Science coverage is likely to remain poor in corporate mass media. The bean counters don't understand science. The moguls don't understand science. The journalists in general don't understand science. They'll probably remain disgustingly ignorant for disgusting decades to come. So the presence of a horoscope will keep indicating a medium's scientific invalidity: media that publish horoscopes pander and profiteer; they don't understand science, and don't respect the reader enough to report reality.

Less-Filtered Voices

Now, however, little voices have a far better opportunity to be heard. I run an independent magazine, and I can print anything that won't alienate my subscribers. My contributors are often delighted to find an outlet where science, validity, and humor dominate decision-making. Horoscope-free specialty newsletters and magazines abound – seek them at your newsstand and library.

But the biggest influence by far is the World Wide Web. Small media have a far louder voice when you read what they say. For a horoscope-free, non-corporate take, follow links from these among your explorations: disinfo.com; projectcensored.org; transparency.org; eurekalert.org; quackwatch.org; debunker.com; csicop.org; utne.com. I don't agree with all their views, but I don't think any of them features a horoscope.

Because media like those – and of course your own favorite alternate viewpoints – can no longer be stifled, corporate influence is actually limited. If corporate media don't serve your needs, stop buying them, and find your own horoscope-free inputs instead.

How Much Pull?

Norman Sperling, BASIS, vol. 21, no. 4, October-December 2004, p10.

Every few years, somebody makes up a claim that the arrangement of celestial bodies caused, or will cause, something big to happen. This stirs the ignorant among the public and the media, sells tons of books and tabloids, and fills airwaves with blather, all without benefit of actual factual content.

Half a century ago, the Austrian psychiatrist Immanuel Velikovsky published Worlds in Collision. This book said Venus erupted out of Jupiter, flew close to Earth, and then settled into its present orbit.
This demonstrates utter ignorance of the physical nature of Jupiter – which is so massive that the power needed for such an eruption would demand causes and effects unlike anything witnessed in nature.
It contradicts what we understand about chemistry – how could the oxidizing atmosphere of Venus arise from the reducing atmosphere of Jupiter?
It demonstrates utter ignorance of gravitational interaction – how could a close approach of Venus part the Red Sea without causing many other massive tidal disruptions?
It demonstrates utter ignorance of celestial mechanics – changing to Venus's present orbit requires transferring huge amounts of energy to a very nearby object which, however, does not exist.
It claims Venus and Mars collided a few thousand years ago, which is absolutely contradicted by spacecraft observations of their surfaces, which show every sign that those surfaces are hundreds of millions of years old.

Worlds in Collision went through many printings, making a lot of money for its author. It inspired supporters who still claim that it is merely scientists, not Nature itself, who are against Velikovsky. Velikovsky's tale could only appeal to people who have very little knowledge of how those aspects of Nature really work, especially of the amounts of energy involved.

In 1974, John Gribbin and Stephen Plagemann published The Jupiter Effect, claiming that an alignment of planets in 1982 would cause gravitational havoc, triggering, among other things, massive earthquakes in California. Though Gribbin earned a PhD in astronomy, he showed greater interest in earning money from a public who knew less than he did. Again, the amounts don't work out. The alignment was weak. The gravitational difference was trivial. Such alignments have occurred repeatedly in the past, and didn't trigger massive earthquakes or any other noticeable effect.

Real scientists debunked the claims immediately. Planetaria produced shows explaining why the book was bunk. Amateur astronomers held star parties around alignment time to show the planets to the public. As scientists predicted, contrary to Gribbin and Plagemann, none of the Jupiter Effects actually occurred. However, Gribbin and Plagemann earned quite a lot of money from book sales, media appearances, and so on.

Richard Noone pulled a similar stunt in his 1982 book 5/5/2000. Yet again, he claimed that planet alignments would gang up to pull on Earth, this time triggering rampant glaciation. Yet again, book buyers were fleeced (by the poor writing quality as well as the contents). Yet again, the public was deceived by gullible media, especially websites. Yet again, the date came and went and nothing they predicted happened.

In 1987, Jose Arguelles concocted a tale of "Harmonic Convergence" and published it as The Mayan Factor. Arguelles made up a "Mayan" calendar cycle that doesn't come from any archaeological record. He claimed that in 2012 a "galactic wave" would culminate in a new age, allowing Earth to join the Galactic Federation and its Council. This was a total fabrication from science fiction and New Age themes, not anything real.

Adherents claim earth's resonant frequency is changing from "8 Hertz per second" (a garbled term) to 13; I know of no geophysical measurement supporting this. They claim that this energy boost (is it?) accompanies the decrease of Earth's magnetic field to zero. That's also a mixture of garble and garbage.

The "Harmonic Convergence" played on the same ignorance of the same public – who don't know the Earth's structure, let alone the Galaxy's. It, too, enjoyed big, profitable sales. It, too, resulted in no geophysical effects. The public was deceived again, fleeced of its money and attention. Again, the media – ignorant of the realities of nature, and more eager to share circulation gains from spreading claims than to verify them with experts – fostered the public ignorance, thereby compounding it.

It's been a few years. Someone is going to concoct another fiction, and sell it.

But there's also another trend at work. The earlier books made much more stir than the later ones. They went through more printings, and probably made more money, than the later ones. While the media certainly still aren't science-literate, they've shown progressively less gullibility in this sequence; the 5/5/2000 event created only a minor stir, largely in the uncontrolled claims rampant on the WWW.

One contributing factor is the rising percentage of the public that has passed college science survey courses. A quarter of a million US college students take intro-astro courses every year. Throughout the developed world, education is providing the public with a better basis to judge claims with. Science hasn't won yet, but we're blunting the bunk a bit.
Astronomy Pseudoscience Public Policy Human Behavior

Sperling's 8-Second Law: All Total Solar Eclipses Last 8 Seconds

© 1980 Norman Sperling. Excerpted from What Your Astronomy Textbook Won't Tell You, 0-913399-04-3. First published in Astronomy magazine, vol. 8, no. 8, August 1980, 24-25.

Everyone who sees a total solar eclipse remembers it forever. It overwhelms the senses … and the soul as well – the curdling doom of the onrushing umbra, the otherworldly pink prominences, the ethereal pearly corona. And, incredibly soon, totality terminates.

Then it hits you: "That was supposed to last a few minutes – but that couldn't have been true. It only seemed to last 8 seconds!"

This effect frustrated my first 4 eclipses, and most fellow eclipse fanatics assure me they've been bothered by it, too. Yet tape recordings, videos, and the whole edifice of celestial mechanics all claim that it did last the full, advertised 2 to 7 minutes – to within a few seconds, that's what really happened.

Where did all that precious time get lost?

Your Textbook

© 2002 Norman Sperling. Excerpted from What Your Astronomy Textbook Won't Tell You, 0-913399-04-3.

Whichever textbook you use, you need to understand its context.

Your textbook contains a lot of features to help you learn the concepts and information. Use the captions, the glossary, the learning objectives, the chapter-end questions, and the further readings, every time they'll help you learn, not only when your prof assigns them.

Your textbook is far more up-to-date, much better illustrated, and far more informative than

my introductory-astronomy textbook:

George Abell: Exploration of the Universe, 1964

I used George Abell's Exploration of the Universe in 1965 as a freshman at Michigan State. It was exciting! Not only did it shovel nifty information at me, it conveyed the excitement of research, and the latest perspectives. It even included a few color pictures. (Textbooks didn't get color on every page till the late 1980s. Prices skyrocketed because that's a lot more expensive to prepare and print.)

When I look at Abell's textbook now, however, I cannot help but chuckle. It is so naïve, so ignorant! The pictures look crude, because we have much better technology nowadays. The data are elementary. Spacecraft had only just reached Mars and Venus. Some concepts seem rather strange because we think of those things differently now. There is no mention of background radiation (discovered later that year) or pulsars (they weren't discovered till 1968), and no spacecraft pictures of Jupiter. Computers were huge, clunky, and rare. In so many ways, they didn't understand their clues – they didn't know impact craters pepper the whole solar system, and they didn't know rings circle all the big planets.

But my text was certainly a good-faith rendition of the astronomy of its era. The fact that it gave me no hint of all that was to come reveals a trait common to most textbooks: they are overly-positive. They concentrate so much on what they DO know that they neglect to point out what they DON'T know.

Abell's book was definitely a big improvement over the previous dominant textbook:

Robert H. Baker: Astronomy, 1930

Baker's book went through 10 editions from 1930 clear into the 1970s, a huge span for any textbook. I often checked it out of my city library while in high school, and was surprised it was not the one my prof required in college … surprised, and soon happy. That's because Abell deliberately included astronomy's excitement, and Baker never did. All the data and pictures and understandings of its time are there – the pictures were the very best available – but recited in a dry, declaratory way. That's the kind of person Baker was. Charles J. Peterson relays this story witnessed by a former student of Baker's:
One day a student approached Baker in his office at the University of Illinois to seek help on a concept which he was having difficulty understanding. Baker reached over to his bookshelf for the latest edition of his text. He thumbed to the relevant page and proceeded to read the paragraph pertaining to the student's inquiry.
"I don't understand," responded the student.
Baker read the paragraph a second time.
"That's what I don't understand," replied the student.
Baker then read the paragraph for a third time.
"But I still don't understand," lamented the poor student.
Baker returned the volume to the bookshelf and turned to face the student. "I'm sorry, but I can't help you," he said. "I've given it the best shot I can."

Baker's book is a good-faith rendition of the astronomy of its era, but laughable now. It is so naïve, so ignorant! How primitive they were! They didn't know that galaxies were a big story. Spacecraft were still science fiction. Computers were undreamt of. And so on. Astronomers back then were just as smart and clever as modern ones, but they had a lot less to go on, and it shows.

Nevertheless, Baker's book marked a major improvement over:

Forest Ray Moulton: Astronomy, 1906

Moulton was a leading astronomer of his time, teaming with Thomas C. Chamberlain to propose how the solar system might have formed as a result of another star coming very close to the Sun. Though later data disproved the Chamberlain-Moulton theory, it was advanced for its era.

Moulton's book is now a giggle-factory. The writing is not just passive-dull but downright stodgy. The contents are so naïve, so ignorant! This was before radio astronomy, before anyone knew how fusion works. It's not that much is wrong, but it sure makes you appreciate how much has been learned since then.

Yet it, too, was a good-faith rendition of the astronomy of its era: full of the latest data, and a few recent pictures. And Moulton marched in the forefront of education: his book was also chopped into small sections and marketed for correspondence courses, an early form of "distance learning". Moulton's textbook first appeared in 1906, and remained in print through the edition of 1938.

For all its shortcomings, Moulton's text was a major improvement over the previous dominant text:

Charles A. Young: A Textbook of General Astronomy for Colleges and Scientific Schools, 1888

Young was a veritable textbook factory. He produced several different levels of text, topped by this full-math version for the most technical students, and cut down successively for non-math college students, high-school students, and, in Lessons in Astronomy, for junior-high. I've often thought that should have been titled "Lessens" because of how much Young lessened the book. General Astronomy went through about 7 editions from 1888 to 1916.

This book tells you what astronomy knew at the time. It is so naïve, so ignorant! This was before most astrophotography, before mountaintop observatories, before anyone understood stellar spectra or how celestial objects evolve. Reading and laughing at an edition of this, which a student had picked up at a flea market, got me started in studying old textbooks. (Thank you, Carin!) Despite how poorly it has aged, it was a good-faith rendition of the astronomy of its age. And, in turn, a major improvement over:

J. Dorman Steele: A Fourteen Weeks Course in Astronomy, 1869

Steele was also a textbook-factory. He wrote A Fourteen Weeks Course in Chemistry, A Fourteen Weeks Course in Natural Philosophy, A Fourteen Weeks Course in Geology and others. They were illustrated with the latest woodcuts. And they told what astronomy understood back then. It is so naïve, so ignorant! And so awkward! They didn't yet have mountaintop observatories or much stellar spectroscopy. If you read Steele's book now, read it for humor or history, not for modern astronomy. Modern it is NOT! Steele published several editions from 1869 to 1884. But it was a good-faith rendition of the astronomy of its era. And, especially for readability, a huge improvement over:

Sir John Herschel: Outlines of Astronomy, 1830

For the 90 years from the time the author's father, William Herschel, discovered Uranus in 1781, till John Herschel died in 1871, they were dominant authorities. His is not merely a textbook but a compendium: it is intended to record full information about the entire subject. Practically every astronomer who could read English kept a copy of this book as the first place to check for information. Usually, they could find answers in Herschel. Only if this source failed did they seek another. And yet any student passing intro-astro now should be able to amplify many of the topics. Herschel's book isn't wrong, but it is very fragmentary.

The first edition was an instant hit in 1830, and new editions kept coming, and coming, and coming. John Herschel died 41 years later, but the book still stayed in print; the final edition came out in 1905. A 75-year press run! Staggering!

Though this book contains all the information you could want, it conveys absolutely no interest at all. Even the dullest lecturer is better than this! All the excitement had to come from the reader, because none can be found in the book itself. And, of course, the stilted language further highlights its age. It is so naïve, so ignorant, so turgid! This was before spectroscopy, before the physical nature of most celestial objects could even be described. Yet it was globally-proclaimed as a good-faith rendition of the astronomy of its era. And it was quite an improvement over:

John Bonnycastle: An Introduction of Astronomy in a Series of Letters from a Preceptor to his Pupil, 1786

This text is the earliest to which I've been able to trace the modern arrangement of topics. While things have certainly changed a lot in proportions and details, it seems to have been Bonnycastle whose arrangement was tweaked by succeeding authors to evolve into the common one used today.

This book is hard to read, not only because of its antiquated language, but also because of its antiquated typography: the "s" is a half-crossed "f", "ct" uses a flowery ligature, and so on. The bulk of this book deals with how things move, because almost nothing was known about what they are physically made of. This was before telescopes grew wider than 25 cm. This book is a good-faith rendition of the astronomy of its era. 8 editions of Bonnycastle's book were published in England between 1786 and 1822. It is so naïve, so ignorant! And so hilarious! Yet, in its time, it was a major improvement over:

James Ferguson: An Easy Introduction to Astronomy, for Young Gentlemen and Ladies: Describing The Figure, Motions, and Dimensions of the Earth; the different Seasons; Gravity and Light; the Solar System; the Transit of Venus, and its Use in Astronomy; the Moon's Motion and Phases; the Eclipses of the Sun and Moon; the Cause of the Ebbing and Flowing of the Sea, &c., 1768

James Ferguson had a full-size text (said to have interested William Herschel in astronomy) as well as this cut-down version.

This one takes the literary form of a dialog between college-man Neander and his sister Eudosia. Neander is home for term break, and his sister is pumping him for all the neat stuff he learned in his astronomy course. In the middle of page 75, Eudosia sighs.
Neander: Why do you sigh, Eudosia?
Eudosia: Because there is not an university for ladies as well as for gentlemen. Why, Neander, should our sex be kept in total ignorance of any science, which would make us as much better than we are, as it would make us wiser?
Neander: You are far from being singular in this respect. I have the pleasure of being acquainted with many ladies who think as you do. But if fathers would do justice to their daughters, brothers to their sisters, and husbands to their wives, there would be no occasion for an university for the ladies; because, if those could not instruct these themselves, they might find others who could. And the consequence would be, that the ladies would have a rational way of spending their time at home, and would have no taste for the too common and expensive ways of murdering it, by going abroad to card-tables, balls, and plays: and then, how much better wives, mothers, and mistresses they would be, is obvious to the common sense of mankind. – The misfortune is, there are but few men who know these things: and where that is the case, they think the ladies have no business with them; and very absurdly imagine, because they know nothing of science themselves, that it is beyond the reach of women's capacities.
Eudosia: But is there no danger of our sex's become too vain and proud, if they understood these things as well as you do?
Neander: I am surprised to hear you talk so oddly. – Have you forgot what you told me two days ago? namely, that if you had been proud before, the knowledge of Astronomy, you believed, would make you humble?

Proto-feminism, 1768!

Neander's name means "new man". New, because he's going to college, even though he is from the newly risen moneyed commoners. Until his time, to attend either Oxford or Cambridge (the only colleges in England), one had to be a white, male, member of the Church of England, and member either of the nobility or the clergy. By that standard, I suppose that not one single one of my thousands of students would get into college! How about you? Well, they let us all in now. Let's make the best of it while we're here!

The Ferguson book now makes great comedy for its literary form, as well as for its phrasing and scientific contents. It is so naïve, so ignorant! And so hilarious! This was before Uranus was discovered, before gravity was proven to work beyond the solar system. The first edition was published in England in 1768, and the last in the US in 1819. Yet it was a good-faith rendition of the astronomy of its times, and a major improvement over:

William Whiston: Astronomical Lectures Read in the Publick Schools at Cambridge, 1715

Whiston was Isaac Newton's hand-picked successor as Lucasian professor at Cambridge. (Other famous Lucasian professors: early 2000s – Stephen Hawking; 2400s – Cmdr. Data.) Whiston had a varied career worth looking into. This book poses many difficulties for the modern reader: antiquated typography, stilted phrasing, passive dullness, and overwhelming concern with the today-minor issue of sky motions. Whiston published a Latin edition in 1707, his first English edition in 1715, and a second in 1727, the year Newton died. It is so naïve, so ignorant! And so hilarious! This was before achromatic telescopes, before the first predicted return of Halley's Comet. While the contents aren't wrong, they barely hint at the main thrusts of modern science. Yet Whiston's book was, in its turn, a good-faith rendition of the astronomy of its era, and a major improvement over its predecessors ...

Past, Present and Future

You get the point. Astronomy (if not its college textbooks) goes back to early printing, to mediaeval manuscripts, to ancient scrolls, to cuneiform clay tablets and hieroglyphic-engraved stone monuments. And because scientific knowledge progresses, each edition ages rather poorly, and after a while serves better as a poor example than a good one.

Your text stands at the front of this long line. It is the modern culmination of all these successive approximations to what astronomers had learned about the universe. It is a good-faith rendition of the astronomy of right now. It tells the best anyone knows. With spacecraft that have gone as far as ours, with telescopes as big as ours, this is what we have learned.

And it won't end with your book! The author is probably already updating it for the next edition. And future authors will publish new ones after that. Some of what it says may be wrong, but since we don't know which things, we teach as best we know. Many future discoveries will bring system to current odds-and-ends. Many future discoveries will bring up important aspects scarcely hinted at so far. But we can't teach them, because that stuff hasn't been learned yet.

20 years from now, we'll know a lot better than some of the things in your book. Will you be the author of that one? 50 years from now, a better text will outmode that one. And 100 years from now, a more-improved version will relegate that one to humor. And 1000 years from now, all those will look hopelessly naïve, ignorant, and mistaken! And hilarious!

We teach what we know and understand now because that's the best we can do. That's what your book tells, in all good faith, however incomplete or mistaken it may turn out to be. Study it well, use it for all it's worth, learn it as the best anyone can do so far, but learn it as a framework into which the improvements of the future can be plugged in.

[The same can be said for all subjects in which knowledge progresses. Learn all of those subjects with the same perspective.]


TEACHERS: Similar sets of new-to-old textbooks are now available for sale! In stock:
History of Science
Philosophy of Science

We can assemble similar sets in most academic subjects.
Contact normsperling [at] gmail.com to get yours. This is a VERY impressive lesson for students!

Take a Nebula, Condense and Stir

Space age research shows that the Solar System’s members are all cousins. They started with the same ingredients in the same nebula, and underwent related processes.

Their mass, and how hot they got inside, govern which processes each object underwent, making them the way they are today. So my graph plots mass versus how hot they got, arraying characteristics that are all talking about the same things.

Some of the old categories are distinguishable, and some are not. Comets (retaining original ices) all plot left of “the water’s edge”. Meteorites are all the small things at the bottom. Stars shine at top right.

But “planets” includes some objects that are physically like brown-dwarf almost-stars, other objects that are like the 7 big moons, and one object scarcely distinguishable from comets. “Asteroids” now have known borderline-cases with comets, meteoroids, and moons; planetologists have long suspected that small moons are captured asteroids and comets, and not original equipment.

Tectonics, subduction, and volcanism only occur on a few differentiated objects. These processes require a rigid (solid, cooled) surface, overlying a warm, fluid interior. On my graph, these conditions occupy a small zone: the smaller planets, and larger moons and asteroids.
Everything above that zone (more massive) has stayed fluid through the present, so they have no crust on which to show tectonics, subduction, or volcanism.
Everything below that zone (less massive) is so small it lost heat almost as fast as it gained heat, and probably never melted, differentiated, and formed a solid crust over a liquid mantle.
Everything left of that zone (colder) never melted and differentiated, so there was no warm fluid to drive tectonics, subduction, or volcanism.
And no object lies right of that zone because anything that hot is so massive that it plots higher on the graph.

excerpt from What Your Astronomy Textbook Won't Tell You, pp 68-70.

FFNs, LBBs, and LBMs

© Norman Sperling 2002. Excerpted from his book What Your Astronomy Textbook Won't Tell You, 0-913399-04-3.


When novices start to use their first telescope, they look at the sky's major showpieces, such as the Messier nebulae, clusters and galaxies. They're big and bright enough to show up in binoculars, and a beginner's telescope shows detail in many of them. In the background lurk many more faint objects.

Experienced skywatchers buy bigger and better telescopes, seeing ever-richer detail in more and more nebulae, clusters and galaxies. But always, in the background, there are even more objects, too small and faint to make out. Some irreverent amateur astronomers in San Jose call those background objects "Faint Fuzzy Nothings" – FFNs.

FFNs continue in the background as seen by big, professional telescopes, too. Look at a picture of a galaxy in your textbook. In the background you can often notice dim smudges. Each of those is a galaxy, too, but so much farther away that you can't make out as much detail. A 3-meter-wide telescope shows magnificent detail in objects that amateurs can barely glimpse – and in the background lurk uncountable thousands of more FFNs. A 6-meter telescope shows detail in those, and in the background, even more FFNs. A 10-meter telescope reveals detail in those objects ... and in the background, there are ever more FFNs. No telescope has ever been made that didn't find more FFNs in the background.


One day when I was visiting my brother, a bird-watcher, I noticed his log of sightings. Almost every entry included "LBB". He told me that LBB stands for "little brown bird". They are so common, so small, and so similar, that they're not worth examining to see which common species each one belongs to. They flock all over, they're usually there, and they're not the big or pretty or rare birds that bird-watchers prize.


The university's mycological society hosted a meeting about LBMs. Mycologists study fungi, and I didn't have to attend to figure out that "LBM" stands for "little brown mushroom". LBMs are so common, so small, and so similar, that they're not worth examining to see which common species each one belongs to. They're not the big or pretty or rare mushrooms that fungus-hunters prize.

There's more! In prospecting, ignore LGRs: "Little Grey Rocks". In wildflowers, ignore DYCs: "Darned Yellow Composite" flowers that fill meadows. Among stars, ignore MV red dwarves. Among meteorites, ignore L6 "ordinary" chondrites. Among galaxies, ignore dE dwarf ellipticals. In archaeology, ignore undecorated body shards (they don't have initials, but ignore them anyway). In entomology, ignore midges.

The same principle applies outside of science. In coin collecting, ignore small copper coins. In stamp collecting, ignore definitives. In antiquarian books, ignore textbooks. And in the serious study of literature, ignore science fiction.

This happens a lot in science. Beginners learn all the kinds of phenomena in the field, and quickly concentrate on certain ones, all but ignoring certain others. Sometimes practicality forces the distinction: some are available, others are too difficult to study. Often, though, it's about what's fashionable to study.

Technology advances at such a furious pace these days that it may be worth looking anew at common background items, using the latest devices. Most people don't pay attention to them. You just might recognize something interesting that no one noticed before.

What is a Galaxy 'Spiral Arm'?

© 2002 Norm Sperling, excerpted from What Your Astronomy Textbook Won't Tell You

The Milky Way, and many other disc-shaped galaxies, are said to have "spiral arms". The term comes from early drawings and photographs, which show an overall spiral impression in the bright parts.

Humans tend to "connect the dots". When you carefully inspect photos of real galaxies, hardly any have arms so smooth you can actually trace them all the way around.

The Journal of Irreproducible Results
This Book Warps Space and Time
What Your Astronomy Textbook Won't Tell You

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