That Time When a NASA Satellite Spied on Mars Robots

20 years ago, the Mars Global Surveyor was a trailblazer among NASA spacecraft, but it also liked to encroach on the privacy of other Mars robots.

November 8, 2016
5:04 PM EST
Artist's impression of Mars Express (main) and how the satellite looked to the Mars Global Surveyor at between 155 and 230 miles away (insert). Credit: NASA