Martian sunset: Spirit at Gusev crater.
NASA's Mars Exploration Rover
<a rel="nofollow" class="external free" href="http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a/sunset_a489_gamma_2sub_800.jpg">http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a/sunset_a489_gamma_2sub_800.jpg</a> linked from <a rel="nofollow" class="external free" href="http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a.html">http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a.html</a>; losslessly cropped to 2486 pixels wide by 720 pixels high, cropped image data unchanged