The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact ...

A new explanation for the solar system's radioactive elements suggests Earth-like planets might be found orbiting up to 50 ...

The comet is the third object ever confirmed to have entered our cosmic neighborhood from elsewhere in the galaxy. Space ...

Legend has it that somewhere beyond Neptune and Pluto, there is a ninth planet, with a mass that is five times greater than ...

Even the best telescopes can’t see exoplanets. It’s all about watching for jiggly stars, blue shifts, and transits.

This gas cloud located 500 light years away from our solar system is about to become a planet.This process usually takes a ...

Astronomers are uncovering distant worlds beyond our solar system using ingenious indirect methods like observing stellar ...

An ultra-hot rocky exoplanet may be wrapped in a dense atmosphere, defying expectations about what small planets can sustain.

This interstellar vagabond is only the third large interstellar visitor that we have ever discovered — an asteroid or comet ...

The rings of Saturn are normally thought to be flat, but measurements by the Cassini spacecraft show that some of their ...

Webb Telescope detects an atmosphere on TOI-561 b, a scorching rocky planet once thought too small and hot to hold onto its ...

Interstellar comet 3I/ATLAS makes its closest Earth approach on Dec. 19, offering astronomers a rare chance to study a visitor from beyond the solar system ...