A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than the hypothesized Planet Nine. According to a new measurement of the Kuiper ...

As telescopes have become more powerful, it's turned out our solar system is not the only game in town: There are millions of other planets out there in the galaxy. But we're still teasing out clues ...

An exoplanet is what we call planets that exist outside of our own solar system. The first one was discovered in 1992, but as we get more powerful and precise telescopes and instruments, scientists ...