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
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a planet
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flagGreece
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flagthe United Arab Emirates
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flagAustria
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flagFrance
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flagPoland
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flagUnknown
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flagGermany
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flagthe United Kingdom
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flagPakistan
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37%
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flagAustralia
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flagCanada
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26%
38%
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flagthe United States
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55%
31%
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flagIndia
14%
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44%
28%
331
flagthe Netherlands
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18%
11
flagthe Philippines
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59%
11%
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flagSwitzerland
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80%
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