This rock from Theia would have been 2 to 3.5 percent denser than proto-Earth's mantle, based on what is known from the moon and previous models of Theia. Get the Space.com Newsletter.

An analysis of this meteorite dust showed that proto-Earth formed within about 5 million years, which is extremely fast, astronomically speaking.. Put another way, if the entire 4.6 billion years ...

If you compare the solar system's estimated 4.6 billion years of existence with a 24-hour period, the new results indicate that the proto-Earth formed in what corresponds to about a minute and a half.

Water found in ancient Moon rocks might have actually originated from the proto-Earth and even survived the Moon-forming event. Latest research into the amount of water within lunar rocks returned ...

PASADENA, Calif. — Continent-sized remnants of another world could be found deep inside the Earth, according to a new study coming out of California. Researchers believe the remnants could be ...

A new paper disputes the widely accepted hypothesis that the Moon is the product of material thrown up when an object known as Theia smashed into the proto-Earth. Once just one explanation among ...

Like proto-Earth, the young moon was also covered in a magma ocean. The oldest rocks taken from the lunar surface can indicate when the moon’s crust formed.

Earth is the only rocky planet in the solar system with a significant moon. And the moon really is significant: It's roughly 1.2% the mass of Earth . That may not be big in an absolute sense, but ...

Chemistry says Moon is proto-Earth's mantle, relocated Data confirm model in which impact pulverizes Earth like a sledgehammer hitting a watermelon ...

Typically, scientists think the proto-Earth and other planets in the early solar system formed gradually as dust accumulated, clumping into larger and larger chunks, he says.

The Moon has long been the Earth's close companion, ... During this chaotic time, an object the size of Mars smashed into the proto-Earth. "It would surely have been spectacular," says Nimmo.

Dust from meteorites that crash-landed on Earth have revealed that Earth's precursor, known as proto-Earth, formed much faster than previously thought, a new study finds.