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

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

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 ...

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

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

The Solar System is more than just planets; it is home to a dazzling variety of moons, each with its own unique charm. Some ...

Little is known about the long-destroyed moon-forming planet, Theia. But it may have been born in the inner solar system—just like Earth—a new study suggests ...

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

NASA’s lunar orbiter has just revealed a small, previously unseen impact scar on the Moon, a subtle feature that was hiding in plain sight on a surface already crowded with craters. The discovery, ...

Which planet is the furthest from the sun? Some may think it’s Pluto, but it’s actually Neptune. Learn more about this ice ...

Earlier this year, a team of astronomers discovered a new moon of Uranus that is minuscule, with a diameter of about 10km.

Researchers have documented 55 instances of "mini lightning" over two Martian years by eavesdropping on the whirling wind ...