TIL According to space law Weapons of mass destruction are prohibited in space and Moon and other celestial bodies can only be used exclusively for peaceful purposes.

https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/introouterspacetreaty.html

https://www.reddit.com/r/todayilearned/comments/1518gig/til_according_to_space_law_weapons_of_mass/