Astronomy Practice Exam

What does the Big Splash Theory explain?

1. The formation of stars in the universe

2. The origin of the asteroid belt

3. The formation of the moon

4. The creation of black holes

The correct answer is: The formation of the moon

The Big Splash Theory specifically addresses the formation of the Moon. According to this theory, the Moon was formed after a colossal impact event where a Mars-sized body, often referred to as Theia, collided with the early Earth. This violent collision caused a significant amount of debris to be ejected into orbit around Earth, which eventually coalesced to form the Moon. This theory is supported by various lines of evidence, including the similarities in isotopic compositions between Earth and Moon rocks, as well as simulations that demonstrate how such an impact could lead to the Moon's formation. Understanding this origin is crucial as it ties into the broader narrative of Earth’s developmental history and how planetary bodies can evolve in the solar system. The other listed options address different cosmic phenomena and processes. For instance, the formation of stars involves processes like nuclear fusion taking place in nebulae, and the origin of the asteroid belt concerns the remnants from the early solar system that never coalesced into a planet. The creation of black holes relates to the end stages of massive stars or specific collapse scenarios and is not directly connected to the Moon's formation.