Theia (hypothetical planet) - Wikipedia
Theia is often suggested to be around the size of Mars, with a mass about 10% that of modern-day Earth. However, its size is not certain, with some authors suggesting that it may have been larger, …
A Planet Slammed Into Earth 4.5 Billion Years Ago, Forming the Moon ...
Nov 28, 2025 · Around 4.5 billion years ago, a planet called Theia is thought to have smashed into newborn Earth. The messy collision kicked up debris, which probably formed our nighttime …
Lost Planet Theia, Which Created the Moon, Came from the Inner …
Nov 20, 2025 · Roughly four and a half billion years ago the planet Theia slammed into Earth, destroying Theia, melting large fractions of Earth’s mantle and ejecting a huge debris disk that later formed...
Unlocking the origin story of Theia - the planet that made the Moon ...
Nov 24, 2025 · About 4.5 billion years ago, a world the size of Mars crashed into Earth and scattered debris that became the Moon. New measurements of subtle chemical fingerprints in ancient rocks …
4.4 Billion Years Ago, a Planet Collided with Earth—And Changed ...
Feb 19, 2025 · Around 4.4 billion years ago, our planet was still forming, and an ancient protoplanet named Theia was on a fateful path. The Giant-Impact Hypothesis suggests that Theia, a Mars-sized …
When Theia struck Earth, it helped set the stage for life to appear
Jul 8, 2025 · When the protoplanet Theia struck Earth more than 4 billion years ago, it may have delivered important chemicals to Earth that enabled life to appear. Image Credit: NASA/JPL …
Scientists Say: Theia - Science News Explores
Nov 4, 2024 · Theia is a planet-sized object that scientists think collided with Earth about 4.5 billion years ago. When Theia smashed into a young Earth, it would have blasted fragments into orbit.
ASU researchers discover Earth's blobs are remnants of an ancient ...
Nov 1, 2023 · Given such a violent impact, why did Theia's material clump into the two distinct blobs instead of mixing together with the rest of the forming planet? The researchers' simulations showed …
Theia (hypothetical planet) - Wikiwand
Theia ( THEE-uh) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the proto-Earth aroun...
Theia and the Collision That Gave Birth to the Moon
Dec 4, 2023 · 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.