The planet Mars currently appears rather dull and uninteresting in the night sky, yet it is also drawing nearer to us with each passing day. As we noted last month, 2011 is an "off year" for the ...

A NASA mission will send twin spacecraft to Mars to learn what happened to the Red Planet's ancient, thick atmosphere.

The new moon on Aug. 23 at 2:06 a.m. EDT (0606 UTC) is also a black moon, defined as the third new moon in a season that will see four new moons. Three days later, the moon will make a close pass to ...