"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system.

About 4.5 billion years ago, Earth had a violent neighbor. A young, still-forming planet named Theia slammed into our world ...

New research suggests Earth's Moon formed from the catastrophic collision of our planet with its "sister" planet, Theia, born nearby. This "sibling" planet theory, supported by iron isotope evidence, ...

Over 4.6 billion years ago, Earth took shape from a spinning cloud of dust and gas surrounding the young sun. Tiny particles within this cloud collided and clumped together, driven by gravity and ...

Earth will have a visitor within its orbit for the next several decades, according to astronomers. An asteroid named 2025 PN7 has become a "quasi-moon" to Earth, as it will be sharing an orbit with ...

A collision between Earth and a massive Mars-sized protoplanet likely caused the formation of our moon. Now scientists from ...

A University of Georgia sophomore has won a contest to name one of Earth's quasi-moons. Out of nearly 3,000 options, Clay Chilcutt's suggestion of "Caldea" took the top prize in a contest held by ...

People have been talking about Earth's second moon. Though NASA confirmed that a small asteroid named 2025 PN7 is officially a quasi-moon, it's not a real moon. Instead, it's a cosmic tag-along that’s ...

Discover Earth’s unique features—water, atmosphere, magnetic field, life-supporting climate, and 10 key facts about our home planet. Learn what makes Earth truly special.

The sun's gravity will pull the moon farther away from Earth than it's been in over five years on Nov. 19, though it'll be ...