Basic astronomy and night sky information
Thanks to gravity, most galaxies clump together in groups or clusters, so a neighboring galaxy is usually never far away. But the galaxy NGC 6503 has found itself in a lonely position, perched at the edge of a strangely empty patch of space called the Local Void. The galaxy is near enough and bright enough to spot with a small telescope in the northern constellation Draco, the Dragon [Read more…] about NGC 6503, the Lost-in-Space Galaxy
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The waning gibbous Moon about an hour after sunrise on the early morning of June 7, 2015.
“Pausing between clouds
the moon rests
in the eyes of its beholders.”
-Basho
Today, let’s look at the spiral galaxy M83, a lovely cosmic lotus blossom and one of the showpieces in the southern deep sky.
Barely visible from northern latitudes, M83 lies roughly 15 million light-years away in the constellation Hydra. It’s one of the 25 brightest galaxies in the sky, and one of the closest and brightest barred spiral galaxies. At magnitude 7.6, it’s easily visible with binoculars and small telescopes about 18° due south of the bright star Spica, in Virgo, and just north of the star Menkent in the constellation Centaurus [Read more…] about The Southern Pinwheel – M83
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From its launch in 1948 until 1975, the largest telescope in the world was the Hale Telescope on Palomar Mountain in southern California, a giant Newtonian reflector with a mirror 200 inches (5 meters across). Even when Hale was displaced by the 6-meter Russian BTA-6 telescope, it remained the most effective large-aperture telescope in the world because the Russian behemoth suffered from many design flaws and operational problems.
But in the early 1990’s, Hale was bumped once and for all from the top of the telescope world. That’s when the first of the two Keck telescopes, each with 10-meter mirrors, became operational at an observatory on Mauna Kea. Since then, ground based astronomy has entered a new period of rapid innovation and growth as larger and more sophisticated instruments come online, most with adaptive optics and systems to combine the light from more than one mirror. The Keck scopes are still #2 on the list, and were only recently bumped by a slightly larger scope called the Gran Telescopio Canarias. If you are having trouble keeping track of the world’s largest telescopes, the infographic above will help you sort out which is which [Read more…] about World’s Biggest Telescopes
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