Week of March 26-April 1, 2017
After the moon sets this week, get away from bright city lights and take a gander at a pristine rural sky.
If you do this, I recommend you sit back, relax and think about what lies before you. Every light you see in the heavens is a distant sun many hundreds of trillions of miles away — so distant that its light has taken decades, or even centuries, to reach our eyes. Each may be home to a planetary system and, perhaps, life forms gazing in wonder into their own night sky. Each of these suns is part of our own Milky Way galaxy, our "home star city."
Pretty remarkable! But beyond the stars lie other galaxies — at least a trillion of them — that populate the cosmos far beyond the reach of the human eye.
It's true that during the autumn months we can easily spot the great Andromeda Galaxy as a faint smudge between the stars, and that from the Earth's Southern Hemisphere appear the Magellanic Clouds, two nearby galaxies entwined in a gravitational tango with our Milky Way.
But that's pretty much it as far as galaxies go. That's as far as the human eye can see without some help. Aim a small telescope skyward, however, and all that changes, especially at this time of year.
In the region of eastern sky between the Big Dipper, Coma Berenices and Virgo lies one of the richest regions of galaxies visible to backyard telescopes. It's called the Realm of the Galaxies, and it's definitely worth an entry on your bucket list of celestial sights.
Some spring night when the moon isn't up and you're far from city lights, scan your telescope slowly through this region and you'll be stunned by the sight. Even an instrument 4 or 6 inches in diameter will reveal patch after patch of fuzzy light among the much sharper stars — dozens of individual galaxies whose light left their sources when dinosaurs ruled the Earth.
Toward the constellation of Virgo, for example, lies the famous Virgo cluster of galaxies, a system of several thousand galaxies bound together by gravitation and located some 60 or 70 million light-years from our Milky Way. Though we see only the brightest as tiny fuzzy glows of light, most are massive spiral and elliptical-shaped structures with hundreds of billions of suns each.
Farther to the north, in the constellation Coma Berenices, Berenice's Hair, we find the more distant Coma cluster. Lying some 400 million light-years away, this cluster is home to a thousand galaxies that astronomers have discovered are embedded in a region of hot gas. They tell us that as the galaxies move through this material, they seem to become stripped of their own gas and dust, the raw materials out of which new stars and planetary systems are born.
So the next clear dark night, take a telescope out for a spin through the cosmos. In just one short evening, you'll be able to visit not only stars throughout our Milky Way but also dozens of other galaxies across the nearby universe — a feat that would make even the great Captain Kirk envious.
Visit Dennis Mammana at www.dennismammana.com. To read features by other Creators Syndicate writers and cartoonists, visit the Creators Syndicate website at www.creators.com.