Recent geochemical studies show that the chemical composition of the Moon is very similar to that of the Earth—that is, the Moon is made up primarily of terrestrial materials rather than materials from the impacting celestial body. The Earth and Moon are like identical twins. No other celestial bodies we know of share this kind of chemical relationship.
In a recent TED talk, Planetary Scientist Sarah T. Stewart discusses how she discovered new kind of astronomical object — a synestia — which presents a new way to look at the mystery of the Moon’s origin.
