NASA’s Curiosity Rover recently snapped a sunset picture in which Earth appears as bright star on the horizon. On Earth, Mars appears as a steady red point of light in the night sky. Now we know how we look to Mars: the steady blue point of light.
(image credit: NASA/JPL-Caltech/MSSS/TAMU)
More at the link:http://www.nasa.gov/jpl/msl/earth-view-from-mars-20140206/#.UviCN7R-vKd