The Moon is getting 1½ inches (3.8 centimeters) farther away from the Earth every year. Scientists measure the distance to ...

New research suggests Earth's Moon formed from the catastrophic collision of our planet with its \"sister\" planet, Theia, born nearby. This \"sibling\" p ...

These images mark an early milestone in the mission, confirming that OSIRIS-APEX is healthy and on course for its 2029 ...

About 4.5 billion years ago, a colossal impact between the young Earth and a mysterious planetary body called Theia changed everything—reshaping Earth, forming the Moon, and scattering clues across ...

Scientists traced the Moon's parent planet Theia to the inner Solar System, solving a 4.5-billion-year mystery.

Space has a knack for bending our sense of scale. The Moon feels close enough to touch—after all, we see its craters with ...

Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

In the low-grade lens of the TV cameras, between 1969 and 1972, the men who walked the moon were transmogrified into low-gravity Cold ...

Theia, the world that helped form the Moon, came from the Solar System. Chemical clues in Earth and Moon rocks reveal this ...

Key PointsAbout 4.5 billion years ago, a dramatic event transformed the young Earth when a large protoplanet known as Theia struck our planet ...

Skywatchers across the Northern Hemisphere are in for a captivating celestial show this weekend, with the Moon appearing ...

Simulations suggest 2022 RD2 could slip into a temporary orbit around Earth between 2043 and 2044, becoming a mini moon for ...