RT @AstroKatie: Side-by-side footprints on other worlds. @Philae2014‘s footprints on 67P/C-G; human footprint on the Moon. http://t.co/A9SQ8OUosY
RT @AstroKatie: Side-by-side footprints on other worlds. @Philae2014‘s footprints on 67P/C-G; human footprint on the Moon. http://t.co/A9SQ8OUosY