Question

how life began origins nova neil degrasse tyson hd
what catastrophic event is proposed to have led to the moons formation?
a supernova explosion nearby
a mars - sized object colliding with earth
a massive volcanic eruption on earth
a splitting of earths core

Explanation:

The leading scientific theory for the Moon's formation is the Giant Impact Hypothesis. According to this, a Mars - sized body (often called Theia) collided with the early Earth. The debris from this collision coalesced to form the Moon. A supernova explosion nearby would have had a much more catastrophic effect on the entire solar system and is not related to Moon formation. A massive volcanic eruption on Earth or a splitting of Earth's core are not supported by scientific evidence as the cause of Moon formation.

Answer:

A Mars - sized object colliding with Earth.