Spacecraft Searching for Remains of Mystery Planet - Universe Today
[/caption] How did our Moon form? The leading hypothesis, the Giant Impact Theory, proposes that in the formative years of the Solar System, a Mars-sized protoplanet crashed into Earth. Debris from the collision, a mixture of material from both bodies, spun out into Earth orbit and coalesced into the Moon. Soon, this theory will be … Continue reading "Spacecraft Searching for Remains of Mystery Planet"