Favorite tweets

The shadow of fear: the Martian moon Phobos casts a shadow in 2009, as seen by Mars Express https://t.co/bq22SiauYI http://pic.twitter.com/dGtT1Y8YO3

— RidingWithRobots (@ridingrobots) January 21, 2016

via Twitter https://twitter.com/ridingrobots

January 21, 2016 at 12:10PM