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Night Sky: Your number’s up

by Bob Berman
August 6, 2021
in Columns
0
Night Sky: Your number’s up

Here’s what a million looks like, although many of this globular cluster’s million suns appear to blur together near the center. Still, if you can count five stars a second, you could point out all one million stars in about two days.

Here’s what a million looks like, although many of this globular cluster’s million suns appear to blur together near the center. Still, if you can count five stars a second, you could point out all one million stars in about two days. (Matt Francis, Prescott Observatory)

August is when the sky transitions from its least number of faint stars (in the spring) to its greatest number, from September through December.

Although there are 30 trillion cells in the human body, far more than the combined number of stars and planets in our galaxy, we nonetheless associate vastness with astronomy, not biology. In any event, enormous numbers grab our attention. It’s a fairly recent development, since the word “million” didn’t come into general use until the 13th century. Before then, the largest number was a myriad, equal to ten thousand.

A million seemed huge when we were kids and became less intimidating only when we realized it was possible to count to a million. It’s really not so big: A million steps would take you from Woodstock to Brooklyn. A vacation lasting a million seconds would give you only an eleven-day reprieve from office misadventures. 

In astronomy, we use “million” mainly in relation to the sun, which is nearly a million miles wide and sits 93 million miles away. We also use “million” when contemplating our neighbor planets, which are a few dozen million miles from us. 

Like Peter the Great, who had his wife’s lover beheaded and kept that head in a bottle of alcohol in her bedroom for her to contemplate, nature can also be perverse. There’s no rhyme or reason for the numbers that biology or astronomy spring on us. Why do each of our body’s cells have 90 trillion atoms, roughly matching the stars in our local galaxy group? There’s the same number of atoms of air in each breath as there are breaths of air in Earth’s atmosphere. Such numerical coincidences are always interesting.  

Anyway, even a trillion is tiny compared with the largest number of things in the universe — a one followed by 87 zeroes. That’s the sum total of all subatomic particles such as electrons. Yet even all the universe’s material is infinitesimally tiny compared with its size, since the cosmos is mostly empty space. If you let a football stadium represent an atom, its nucleus would be a fly on the 50-yard line. If the universe were a cube 20 miles wide on each side, all the matter it contained would be a single grain of sand.

Basically, there’s nothing here at all. 

Check out more articles from this series.

Tags: membersnight sky
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Bob Berman

Bob Berman, Ulster Publishing’s Night Sky columnist since 1974, is the world’s most widely read astronomer. Since the mid-1990s, his celebrated "Strange Universe" feature has appeared monthly in Astronomy magazine, the largest circulation periodical on the subject. Berman is also the long-time astronomy editor of the Old Farmer’s Almanac. He was Discover magazine’s monthly columnist from 1989-2006. He has authored more than a thousand published mass-market articles and been a guest on such TV shows as Today and Late Night with David Letterman. Berman is director of two Ulster County observatories and the Storm King Observatory at Cornwall. He was adjunct professor of astronomy and physics at Marymount college from 1995-2000.

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