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
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flagGreece
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flagthe United Arab Emirates
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flagAustria
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flagAustralia
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flagthe United Kingdom
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flagthe United States
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flagCanada
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flagSouth Africa
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flagIndia
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flagRepublic of Ireland
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flagSwitzerland
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flagthe Netherlands
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flagthe Philippines
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