Where did the Moon come from? A new theory | Sarah T. Stewart

The Earth and Moon are like identical twins, made up of the exact same materials — which is really strange, since no other celestial bodies we know of share this kind of chemical relationship. What’s responsible for this special connection? Looking for an answer, planetary scientist and MacArthur “Genius“ Sarah T. Stewart discovered a new kind of astronomical object — a synestia — and a new way to solve the mystery of the Moon’s origin. Check out more TED Talks: The TED Talks channel features the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design — plus science, business, global issues, the arts and more. Follow TED on Twitter: Like TED on Facebook: Subscribe to our channel: