Scientists have discovered a rare six-planet system where all planets orbit their star in perfect mathematical harmony.

The potential discovery of a large planet beyond Neptune’s orbit could change everything we know about the Solar System.

The European Space Agency (ESA) and Japan Aerospace Exploration Agency (JAXA) launched the joint Mercury mission in 2018. The ...

Smaller gas giants are less likely to survive in such systems, surrounded by clashing planetary titans. With their lower ...

A planet parade like the one beginning tonight is quite uncommon, occurring once every 10-20 years. Here are the planets you ...

A new theory about Pluto’s largest moon, Charon, could alter how planetary systems are taught in U.S. schools. Scientists ...

The close-up images reveal craters, the floors of which are in permanent shadow, and vast sunlit northern plains.

Hong Kong residents will have the rare opportunity to observe four of the brightest planets in the solar system with the ...

Planet X, also called Planet Nine, is a hypothetical planetary body seven times the mass of Earth lurking behind Pluto. If ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a ...

The innermost Earth-like planet in the famous TRAPPIST-1 system might be capable of supporting a thick atmosphere after all, ...