Did a giant object collide with Earth to form the moon?
Astronomers continue to support the giant-impact hypothesis, which suggests the moon was formed after a collision between Earth and a Mars-sized protoplanet named Theia. This theory remains the leading explanation for the moon's origins, supported by various lines of evidence regarding the early solar system.
Why it matters
Understanding the moon's formation provides critical insights into the early history of the Earth and the evolution of our solar system.
Solar System The moon Did a giant object collide with Earth to form the moon? News By Micah Hanks Published 19 October 2026 The popularity of the giant-impact hypothesis can be attributed to the multiple lines of evidence supporting the impact scenario.
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