Theia (/ ˈ θ iː ə /) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.

2021年3月23日 · Scientists have long agreed that the Moon formed when a protoplanet, called Theia, struck Earth in its infancy some 4.5 billion years ago. Now, a team of scientists has a provocative new proposal: Theia's remains can be found in two continent-size layers of rock buried deep in Earth's mantle.

2023年11月4日 · Theia, an ancient planet, collided with Earth to form the moon, scientists believe. A new study suggests Theia could have also formed mysterious blobs called large low-velocity provinces, or...

2023年11月8日 · Scientists call the scenario where Theia collided into Earth to form the Moon the Giant Impact Hypothesis. There are debates as to whether that collision was head-on or if Earth was sideswiped by...

2020年3月9日 · But deep inside the Moon, the Theia chunk remained relatively intact, and its oxygen isotopes were left closer to their original state. The study claims that this is a pretty neat bit of evidence showing Theia could have formed farther out in the Solar System, and moved inwards before the big bada-Moon-making-boom .

2014年6月6日 · Our triple oxygen isotope data reveal a 12 ± 3 parts per million difference in Δ 17 O between Earth and the Moon, which supports the giant impact hypothesis of Moon formation. We also show that enstatite chondrites and Earth have different Δ 17 O values, and we speculate on an enstatite chondrite–like composition of Theia.

2023年11月1日 · A Mars-size object called Theia smashed into Earth, and the debris coalesced into the moon. Now scientists believe they may have identified pieces of Theia at the bottom of Earth’s mantle.

2023年11月1日 · An artist’s concept showing protoplanet Theia, left, colliding with Earth to eventually form the moon, right, possibly leaving two giant structures embedded in the Earth’s mantle 4.5 billion ...

2023年11月2日 · Their study posits that the large Theia impactor that struck Earth early on in its history, leading to the Moon's formation, might have left large, dense masses deep in our planet’s mantle today. The study will appear in Geophysical Research Letters .

2023年12月4日 · Scientists refer to the rogue impactor as Theia—an ancient deific entity from Greek mythology. Theia is the mother of Selene, known in Roman mythology as Luna, goddess of the Moon. And this story...