Out of this world
Infographic: Every Trip To The Moon, Ever
Long thin grooves - called gullies - on the surface of Mars may have been made not by water but by blocks of frozen carbon dioxide - dry ice. These blocks seem to have flowed down Martian sand dunes on cushions of carbon dioxide gas. Researchers liken these icy sleds to small hovercraft "ploughing furrows as they go".
'Ice hovercraft' tracks seen on Mars
Supernova 1604, also known as Kepler's Supernova, was the most recent supernova visible by the naked eye eminating from within the Milky Way. It occured on October 9, 1604 in the constellation Ophiuchus, and was visible during the day for three weeks. It's currently 14 light years wide and is expanding at a rate of 4,000,000 miles per hour.
Supermoon June 2013!
THIS WEEKEND: Best Way To See 'Supermoon'
Hoag's Object is a mysterious ring galaxy 600 million light years away in the constellation Serpens. The outer ring is composed largely of hot blue stars, while the core is older red and yellow stars. The space in between is almost completely dark. It is thought that this galaxy formed from the collision of two galaxies billions of years ago. Visible near the top of the gap is another ring galaxy, likely much further away.
File:Hoag's object.jpg - Wikipedia, the free encyclopedia
THE CORE OF OUR GALAXY, seen in infrared light by the Spitzer Space Telescope. Blue light is from stars, green light is from polycyclic carbon molecules, yellow and red light is from the thermal glow of warm dust. This image spans approximately 1000 light years by 1600 light years. The galactic core is 26,000 light years away.