An extra solar system planet once orbited next to Earth — and it may be the reason we have a moon

Earth may have a moon today because a nearby neighbor once crashed into us, a new analysis of Apollo samples and terrestrial rocks reveals.

An extra solar system planet once orbited next to Earth — and it may be the reason we have a moon
Earth may have a moon today because a nearby neighbor once crashed into us, a new analysis of Apollo samples and terrestrial rocks reveals.

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