Image of the Day
Observations with NASA's Chandra X-ray Observatory have provided the first X-ray evidence of a supernova shock wave breaking through a ...
Solar Eclipse May 20
A "ring of fire" solar eclipse is coming to the USA this Sunday. It's the first annular eclipse visible from the contiguous United States in almost 18 years.
Venus Transit June 5
On June 5th, 2012, Venus will transit the face of the sun in an event of both historical and observational importance.