Earth's moon may have formed far faster than scientists once believed, with new simulations suggesting it came together in as little as five hours after a catastrophic collision.
The new findings accelerate astronomers' search for moons around exoplanets.
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The Moon formed when Earth was very young. It's likely that one day in the planet's history was marked by a major catastrophe after a collision with another celestial body similar in size to Mars. This was the birth of the Moon, and new research suggests that the Moon may have formed in just five hours.