Answer: The most commonly accepted hypothesis for the origin of Earth's moon is the Giant Impact Hypothesis. It suggests that the moon formed when a Mars-sized object collided with Earth around 4.5 billion years ago. This collision caused material from Earth to be ejected into space, eventually coming together to form the moon. Two pieces of evidence supporting this hypothesis are the similarity in isotopic compositions between Earth and moon rocks, and the moon's composition lacking an iron core. An alternate hypothesis is the Capture Hypothesis, suggesting that the moon formed elsewhere and was captured by Earth's gravity, but it faces challenges in explaining the moon's composition and lack of evidence for capture. The Giant Impact Hypothesis remains widely accepted due to its ability to explain various observed characteristics of the moon.