Scientists have discovered a crater on the moon that's bigger than the Roman Colosseum, the result of a powerful impact two years ago.

Scientists have discovered a crater on the moon that’s bigger than the Roman Colosseum and is the result of a powerful impact two years ago that initially went undetected. The steep-sided hole — about 728 feet across and up to 141 feet deep — is the solar system’s biggest known impact crater carved out in recent times.

Scientists have discovered a crater on the moon that's bigger than the Roman Colosseum and is the result of a powerful impact two years ago that initially went undetected.

Space scientists have revealed that the Moon has been hit by an object "as big as a six-story building."