Despite having the wrong ideas about how the Moon’s craters formed, these 19th-century astronomers created highly accurate ...

The South Pole-Aitken basin is the moon's oldest and largest visible crater—a massive geological wound 4 billion years old ...

Billions of years ago, so the theory goes, something around the size of Mars smacked into Earth, spewing a whole bunch of dirt into space that eventually coalesced to form the Moon. This is called the ...

This was not only the last major addition of material to the Earth, but also the event that formed the moon—and it’s one of the most debated parts of the story. Several different formation theories ...

However, how the moon formed is generally accepted to be after a “great impact” between Earth and a protoplanet. The giant-impact theory proposes that a Mars-sized planet, now called Theia ...

or indigenous to a Moon that may not, in fact, have formed dry. Over the past six years an increasingly complex view of water inside and on the surface of the Moon has emerged. Lunar water has ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The moon has some ...

The findings back up a theory that magma formed the Moon's surface around 4.5 billion years ago. Remnants of the ocean were found by India’s historic Chandrayaan-3 mission that landed on the ...

Just after it formed, the moon was so hot it may have had an ocean of magma on its surface. Another theory says the Earth may have been vaporised in that giant collision, and the moon formed out ...