But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

How do tidal forces shape a planet's orbital evolution, especially for those in the habitable zone? A recently submitted ...

These linkups happen when several planets appear to line up in the night sky at once. Such parades are fairly common, ...

A planetary parade of six planets is visible in the morning sky through August 20, with Mercury joining Venus, Jupiter, ...

A new study published in The Astronomical Journal has revealed an astonishing possibility: free-floating planets, long ...

Jupiter, Mercury, Neptune, Saturn, Uranus and Venus will be visible in the early morning skies over America from Sunday, Aug. 17, to Wednesday, Aug. 20. FOX 5's Liv Johnson reports.

Prior to flybys, scientists used mathematical laws and observation to determine the characteristics of the planets.

Five planets are currently visible from Earth at the same time, in what’s known as a planet parade – or a planetary alignment ...

NASA’s James Webb Space Telescope finds TRAPPIST-1 d lacks an Earth-like atmosphere, narrowing the search for habitable planets.

Chemosynthetic life communities in the Northwest Pacific could offer glimpse of what life might look like on other planets ...