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Did a giant object collide with Earth to form the moon?
Known as the giant-impact hypothesis, this proposed event involves a collision between Earth and a hypothetical Mars-sized protoplanet astronomers call Theia.
What If on MSN
If Earth tilted on its side, life would get strange fast
During Earth’s early days, a gargantuan collision left our planet spinning at an angle. That slight incline allowed life as ...
From the primordial heat left behind by Earth’s formation to the continuous energy released by radioactive decay, discover ...
What would happen if an asteroid struck the Earth? We spoke with a NASA planetary scientist who is working to find out.
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