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Questions regarding Earth's only natural satellite. For questions about the natural satellites of other planets, use the tag [natural-satellite].

9 votes
1 answer
2k views

Had Earth lost the Moon early, would we be able to determine it once had a companion?

Despite the Solar System looking quite stable, clockwork-like on human timescales, to such a degree the movement of its members is used to track time and make calendars since antiquity, it is pretty c …
ksousa's user avatar
  • 1,201
11 votes
1 answer
455 views

If Planet Nine indeed exists, how large a impact event there should be to be seen from Earth?

Recently I've found this news article, A meteorite crashed into the Moon during total lunar eclipse in January, about a collision into the moon that happened while a lunar eclipse was under way. Accor …
ksousa's user avatar
  • 1,201