The Night Sky.
Why can't we find aliens?
Sure, we haven't successfully phoned E.T. yet, says Slate's Chris Wilson. But let's not give up too easily
Asteroid 2005 YU55 will zip by Earth next week
Asteroid 2005 YU55 will come within 202,000 miles of the Earth next week.
Laws of physics 'are different' depending on where you are...
One of the laws of nature seems to vary depending on where in the universe you are, according to data from Hawaii's huge Keck telescope and Chile's Extremely Large Telescope - two of the largest optical telescopes on earth.
Pluto is once again the solar system's biggest dwarf planet...
Pluto lost its status as a planet because of the discovery of Eris, another Kuiper Belt object that was slightly larger. But now Pluto has put Eris back in its place. Astronomers were long uncomfortable with Pluto as a planet, because its small size ...
Your Age on Other Worlds
Find out why people who love birthday parties should move to Mercury.