Uranus' atmosphere is predominantly made up of hydrogen and helium. Unlike Jupiter and Saturn, these light gases dominate only the outer edges of the planet, but are not a significant contributor to the rocky interior.
You don’t have to know a whole lot about science to know that black holes typically suck things in, not spew things out. But NASA just spotted something mighty strange at the supermassive black hole Markarian
The portrait of Stephan's Quintet, also known as Hickson Compact Group was taken by the new aboard NASA's HST as one of the first images since its May 2009 overhaul. Stephan's Quintet, as the name implies, is a group of five galaxies.