What was the object that collided with Earth, according to the giant-impact hypothesis?
a comet
a moon
an asteroid
a planet
According to the giant impact hypothesis Earth once collided with a planet of Mars size usually referred to as Theia, a titaness of Greek mythology, mother of Selene - Moon goddess, which is to reflect the believe the collision was an origin of the Moon.
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a comet
a moon
an asteroid
a planet
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