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

Astronomers have found evidence for what might be a planet with about half the mass of the Moon orbiting the pulsar PSR ...

The spacecraft’s suite of science instruments will reveal the invisible about the solar system’s most mysterious planet, to better understand the origin and evolution of a planet close to its ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

A spacecraft operated by the European Space Agency and the Japan Aerospace Exploration Agency has made its final flyby of Mercury, as scientists now work to guide BepiColombo into the planet’s orbit.