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Did Mars ever crash on earth?

Updated: 8/10/2023
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15y ago

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No, firstly because neither planet really existed at that time (they were barely forming from the disc of debris orbiting the sun - protoplanets) and also Mars has always been right about where it is now, in orbit around the Sun. If Mars had collided with the Earth long ago, there is no force in nature that could have put it into the orbit it now has. But 4 billion years ago, there were probably dozens of other "baby planets" wandering around the solar system, interacting via gravity with each other. Back then , collisions were probably relatively common. Something - probably not quite as big as Mars, but perhaps close - probably DID collide with the proto-Earth, smashing an enormous chunk out of it. The debris from the collision, both from Earth and from that "other planet", then coalesced to form the Moon.

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14y ago
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9y ago

No. Thankfully. However, that does not mean that Earth did not collide at all in the past. When Earth was still an infant, another planet crashed into it, but according to many scientists, it was only a 'glancing' blow. If it had been 'full-on' we would not have come around. Or any life forms for that matter.

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15y ago

No. Mars is where it has always been. If Mars had ever collided with the Earth, it would not be in orbit around the Sun now.

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8y ago

In the Giant Impact hypothesis, the planet that crashed into the Proto-Earth to create the modern day Earth and Moon was a Mars-sized planet was called Theia

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Q: Did Mars ever crash on earth?
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