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

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

Have you ever wondered why the planets in our solar system align along a flat plane? Discover the science behind this cosmic arrangement, from the formation of the protoplanetary disk to the forces ...

"This agreement represents a significant milestone for Planet; it is our largest contract to date and is a major step forward ...

The exoplanet HD 20794d swoops in and out of its habitable zone every few hundred days, making for an extreme climate.

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.

The Blue Ghost lunar mission has captured a gorgeous image of Earth as it ramps up its journey toward the moon.

Planet Labs Wednesday announced a new $230 million multi-year partnership extension with an unidentified Asian-Pacfic ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

Four planets will be in the parade in January, while seven will align in February. Here's how to see the events.

Early 2025 is a good time for skygazing and spotting up to seven planets in the night sky – if you have a little help.