The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Finding a world like Earth elsewhere in the universe might mean looking for the right kind of solar system. A new discovery ...

The study of exoplanets has come a long way since the first detection of a planet orbiting a star other than the Sun in 1995. This groundbreaking discovery, achieved through the radial velocity (RV) ...

Known as the "Parade of Planets," the celestial event will feature appearances from Mars, Jupiter, Uranus, Venus, Neptune and ...

The exoplanet, which has been named HD 20794 d, orbits in the ‘habitable zone’ of a nearby star similar to our sun.

You won't have to wait long for all six planets to be in the sky. They'll be there as soon as the sun sets. Once it's dark, you'll only have a couple of hours to view them before Venus ...

It actually follows its own tiny elliptical orbit around what is called the center of gravity (the barycenter) of the system, the sun and the orbiting planets. This barycenter is usually not equal ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

Certain extreme planets are called ultra-short period objects if they're very close to their stars and orbit them in mere hours, like K2-22b.

Astronomers have discovered a large Earth-like planet orbiting a distant star that could be home to alien life ... It orbits a star, much like our own Sun, and is located just 20 light years away - ...