Earth is far from the only celestial body in the Solar System.

Far beyond the planets, past even the most distant dwarf worlds, lies a vast shell of icy debris that marks the true outer ...

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain ...

It may not feel like it, but everything in the universe is in constant motion. Our Sun, with all its planets, orbits the center of the Milky Way, flying through the cosmos at around 450,000 miles per ...

There's a strong chance our solar system once had at least one more planet than it does today and that the odds of the moons ...

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When 'Oumuamua traversed our solar system in 2017 it was the first confirmed Interstellar Object (ISO) to do so. Then in 2019, Comet 2l/Borisov did the same thing. These are the only two confirmed ...

The comet 3I/ATLAS moves against a backdrop of stars. The ATLAS survey telescope in Rio Hurtado, Chile, was the first to report that the object came from interstellar space. ATLAS / University of ...

On August 25th, 2012, humanity became an interstellar species. There was no fanfare or galactic welcome party as a humble robotic probe, the Voyager 1 spacecraft, crossed an invisible threshold. It ...