The planets in the solar system draw elliptical orbits around the sun. Regarding these orbits, astronomers have proposed the theory that 'sometimes they are stable and sometimes unstable,' and have ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System — a process that’s also applicable for other planets. There could be a ninth ...

Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The solar system suddenly has a new member. A new object ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today." When you purchase through links on our site, we may earn an affiliate ...

Billions of years ago, in the icy outskirts of the solar system, a dramatic collision forged the unusual pairing of Pluto and its moon, Charon. This celestial dance defied expectations, birthing a ...

NASA’s newly launched IMAP mission is set to tell us more about the boundary between our Solar System and interstellar space ...