National Science MacArthur Fellow And Planetary Scientist Sarah Stewart Discusses How The Moon Was Formed 5:12pm October 04, 2018 Science National Share URL copied to clipboard! Play Pause There was an error loading the media player. Copyright 2018 NPR. To see more, visit http://www.npr.org/. 300x250 Ad More All Things Considered National Jury finds 3 former Memphis police officers not guilty in death of Tyre Nichols Health & Safety In Atlanta, CDC staff reel after recent cuts by Pien Huang 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate