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.

忒伊亚（英語： Theia ， / θ iː ə / ）是天文学上假設早期太阳系曾存在於地球轨道上的一颗遠古矮行星，估测位於地球-太阳系统的拉格朗日点，其直徑約6,000公里（3,700英里）——差不多跟火星一樣大，屬於行星质量级别的地球特洛伊。

Nov 8, 2023 · But a study published recently in Nature suggests that some of Theia is hiding deep within Earth in the form of unusual blob structures in our planet’s lower mantle. Called the large low-velocity...

Mar 23, 2021 · 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.

Nov 1, 2023 · When the impactor Theia hit Earth 4.5 billion years ago, it broke apart, and clouds of molten debris and vapor surrounded Earth, congregating to form the moon. In the past 50 years, scientists ...

Nov 1, 2023 · The new research on Wednesday indicates the blobs are "buried relics" of Theia that entered into Earth during their formative collision -- and have been hiding near our planet's heart ever since.

Nov 26, 2023 · New research suggests that large remnants of Theia, a Mars-sized object that collided with Earth to form the Moon, still exist within Earth's mantle. These remnants are thought to be linked to seismic anomalies and could provide insights into Earth's geological history and plate tectonic patterns.

Apr 8, 2021 · An ancient impactor called Theia hit the Earth to create the moon. New research suggests the rest of that planet may still be inside the Earth.

Nov 2, 2023 · Scientists have a theory that an ancient planet, called Theia, crashed into Earth more than 4 billion years ago. In this theory, part of Theia was swallowed up by the Earth and the impact of...

May 25, 2021 · Fast forward to 2021, and we've got the first real evidence for the existence of Theia, the protoplanet that struck our nascent Earth. At the 52nd Lunar and Planetary Science Conference in March, 2021, Qian Yuan, geodynamics researcher at Arizona State University (ASU), Tempe, presented data — not fully verifiable proof — supporting the ...