Alexander Gerst on Twitter
https://mobile.twitter.com/esa/status/1001715340773031936
https://mobile.twitter.com/esa/status/1001715340773031936
Why does asteroid 2015 BZ509 orbit the Sun the backwards? As shown in the featured animation, Jupiter’s trojan asteroids orbit the Sun in two major groups — one just ahead […]
https://img.youtube.com/vi/btIGDkR3Tpo/maxresdefault.jpg
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https://mobile.twitter.com/esa/status/1001543914413752321
https://mobile.twitter.com/esa/status/1001543428113616897
https://mobile.twitter.com/esa/status/1001507694455541761