About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia ...
On October 30, 2025, scientists around the world watched as the interstellar comet 3I/ATLAS made its closest approach to the ...
Space.com on MSN
Earth and Theia smashed to birth the moon, but did they first start out as close neighbors?
"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system.
The impacts that started on July 16, 1994 ended on July 22, 1994, were captured by NASA’s Galileo orbiter that was enroute to ...
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They went through the isotope mixtures in Earth and lunar rocks instead of using highly technical models. They dabbled in ...
Smithsonian Magazine on MSN
A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon. The Projectile May Have Been Our Neighbor
Little is known about the long-destroyed moon-forming planet, Theia. But it may have been born in the inner solar system—just like Earth—a new study suggests ...
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