Question

1. describe the giant-impact hypothesis.

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Explanation:

The Giant-Impact Hypothesis is the leading scientific model for the formation of Earth's Moon. It proposes that early in the solar system's history (around 4.5 billion years ago), a Mars-sized celestial body (often called Theia) collided with the young, proto-Earth. The violent impact ejected massive amounts of molten rock and debris from both bodies into Earth's orbit. Over time, this debris coalesced due to gravitational attraction to form the Moon. Evidence supporting this includes the Moon's similar isotopic composition to Earth's crust, its small iron core, and the angular momentum shared between Earth and the Moon.

Answer:

The Giant-Impact Hypothesis is the dominant model explaining the Moon's formation: ~4.5 billion years ago, a Mars-sized body (Theia) collided with the young proto-Earth. The impact ejected vast amounts of molten debris into Earth's orbit, which then gravitationally coalesced to form the Moon. Key supporting evidence includes the Moon's isotopic similarity to Earth's crust, its small iron core, and the shared angular momentum of Earth and the Moon.