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

According to a recent YouGov poll, 35% of Americans think Pluto is not a planet. But they are all wrong—kind of. To get to ...

Stargazers can witness a rare 'planet parade' in January and February 2024, where six planets align prominently in the night ...

Mercury takes only 88 Earth days to orbit the sun.

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.

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

Five of the brightest planets will be visible to the naked eye. With help, you may even spot Uranus and Neptune.

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

Using data from the European Space Agency's Gaia mission, scientists have found a huge exoplanet and a brown dwarf. This is the first time a planet has been uniquely discovered by Gaia's ability to ...

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