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

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

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

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

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.

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

Free-floating, planetary-mass objects that are just drifting carefree through the galaxy, untethered and starless, appear to be able to generate their own systems of moons, like a planetary system on ...

While most of the planets will be visible to the naked eye, others will require special equipment to be spotted.