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

An illustration depicts what the surface of one of the exoplanets orbiting Barnard's Star may look like. The other three planets within the system can also be seen. - International Gemini ...

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

Astronomers have discovered a rare solar system with six planets moving in sync with one another. Estimated to be billions of years old, the formation 100 light-years away may help unravel some ...

(CNN) — Astronomers have discovered three previously unknown moons around Uranus and Neptune, the most distant planets in our solar system. (CNN) — Astronomers have discovered three previously unknown ...

Astronomers studying a disk of material circling a still-forming star inside our Galaxy have found a tantalizing result — the inner part of the disk is orbiting the protostar in the opposite direction ...

On Dec. 12, 1967, NASA launched the Pioneer 8 spacecraft on a mission to study the sun. [‘On This Day in Space’ Video Series ...

An "extra exceptional" Tatooine-like exoplanet, orbiting two suns, has been discovered. Astronomers say the "huge" new world ...

The Sun has a new neighbor that was hiding in plain twilight. An asteroid that orbits the Sun in just 113 days–the shortest known orbital period for an asteroid and second shortest for any object in ...

2185_HamiltonSpectrographVogt © 2003 Laurie Hatch, image and text – Lick Observatory – Mt. Hamilton 2003 December 11 – The Shane 120" Reflector was the second ...

The European Southern Observatory said the discovery as "the first clear detection of a baby planet in a disc with multiple rings" Abigail Adams is a Human Interest Writer and Reporter for PEOPLE. She ...

This discovery was made by two of NASA’s most celebrated telescopes. This illustration provided by Dan Durda shows the exoplanet Kepler-1625b with a hypothesized moon. On Thursday, Oct. 4, 2018, two ...