‘Featured Articles’ Archives
A great video showing what it would be like if different planets in out solar system shared an orbit with our Moon. Scale from Brad Goodspeed on Vimeo.
The best way to see this image of globular star cluster Omega Centauri (NGC 5139) is to look at the large version. The sheer number of stars is staggering. NGC 5139 is some 15,000 light-years away and 150 light-years in diameter. Packed with about 10 million stars much older than the Sun, Omega Cen is the largest of 200 or so known globular [...]
Nebulae are perhaps as famous for being identified with familiar shapes as perhaps cats are for getting into trouble. Still, no known cat could have created the vast Cat's Paw Nebula visible in Scorpius. At 5,500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms. [...]