Journey beyond Neptune to uncover the frozen, mysterious worlds that challenge everything we thought we knew about the solar ...

Scientists have been trying to find a hypothetical Planet 9 that may exist outside our known solar system based on the unusual orbits of certain dwarf planets. But those orbits might not require a ...

Venture into the extreme outer reaches of the solar system to explore the most distant and enigmatic bodies ever discovered. Meet Sedna, Gong Gong, and Eris as we investigate their strange orbits, ...

Earth has picked up a new traveling companion – an asteroid named 2025 PN7 that now moves through space in step with us. This ...

Studying the orbits of thousands of exoplanets shows that large planets tend to have elliptical orbits, while smaller planets tend to have more circular orbits. This split coincides with several other ...

This discovery was made by two of NASA’s most celebrated telescopes. This illustration provided by Dan Durda shows the exoplanet Kepler-1625b with a hypothesized moon. On Thursday, Oct. 4, 2018, two ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

At a young age, we're told how the sun warms Earth and makes life possible. That idea sticks with most of us for life. But ...