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

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.

Temperamental' stars that brighten and dim over a matter of hours or days may be distorting our view of thousands of distant planets, suggests a new study.

The ESA’s Gaia mission mapped the positions and velocities of stars with extreme precision by measuring about one billion ...

WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these ...

New James Webb Space Telescope observations of a star cluster called NGC 346 are shedding light on how, when and where planets formed in the early universe.