Researchers Discover Traces of the Planet That Helped Create the Moon

TIME

Analysis of moon rocks brought back by Apollo astronauts has revealed remnants of Theia, the planet that researchers believe collided with Earth to create the moon 4.5 billion years ago.

Researchers have long hypothesized that Theia — named after the Greek goddess who was the mother of Selene, the goddess of the moon — collided with Earth and was destroyed upon impact. Remains of the colliding planet and debris from Earth were thought to have joined together, eventually forming the moon. The moon’s thin core suggests that it was created with the help of two other planets, but no hard evidence has been found to confirm the theory until now.

According to the study published in the journal Science, an analysis of different varieties of oxygen, called isotopes, in the lunar rocks reveals equal traces of both the moon and the colliding planet. The moon rocks also contain a…

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