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Artist's depiction of a collision between two planetary bodies. Such an impact between Earth and a Mars-sized object likely formed the Moon. The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly.
Animation of collision between Earth (blue) and Theia (black), forming the Moon (red and gray). Bodies are not to scale. According to the giant impact hypothesis, Theia orbited the Sun, nearly along the orbit of the proto-Earth, by staying close to one or the other of the Sun-Earth system's two more stable Lagrangian points (i.e., either L 4 or ...
Artist's depiction of a collision between two planetary bodies. Such an impact between the Earth and a Mars-sized object likely formed the Moon. In the early history of the Earth (about four billion years ago), bolide impacts were almost certainly common since the Solar System contained far more discrete bodies than at present.
A visualisation of the huge, glowing planetary body produced by a planetary collision (Mark Garlick) Astronomers have seen the “afterglow” of two huge planets crashing into each other for the ...
Observations made by two telescopes of the Beta Pictoris system, located 63 light-years from Earth, suggest a collision occurred between asteroids about 20 years ago.
A new scientific theory connects mysterious structures deep within Earth's mantle to a violent collision with the protoplanet Theia. A new scientific theory connects mysterious structures deep ...
The Moon's heavily cratered far-side. The origin of the Moon is usually explained by a Mars-sized body striking the Earth, creating a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed.
The fragments can then hit other objects, producing even more space debris: if a large enough collision or explosion were to occur, such as between a space station and a defunct satellite, or as the result of hostile actions in space, then the resulting debris cascade could make prospects for long-term viability of satellites in particular low ...