published on: 2016-05-25 07:11:00
jb2489.tumblr.com/post/144846594100/
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startswithabang: The strongest gravitational show in the Universe
spaceexp: Mars in 2016 via reddit
looking-at-the-universe: Apparent retrograde motion of Mars
startswithabang: Why Does E = mc^2?“Throw in any other constant