A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is hidden in our solar system.

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

Viewed in this longer context, the previously modern idea of having nine planets, which came about in the 1960s and lasted only until 2006, was a blip on the screen. And if you are still a Pluto ...

If you buy through a BGR link, we may earn an affiliate commission, helping support our expert product labs. Most of us grew up learning that there are nine planets in our solar system. Back in ...

Moons of Jupiter and Saturn are wider than Mercury, and Pluto is smaller than Earth's ... that Earthlings loved our familiar family of nine planets. Some astronomers noted that the controversy ...

Known as Planet Nine or Planet X, it is a hypothetical planet ... For more than 70 years, Pluto was classed as the ninth planet but that changed in 2006, when the International Astronomical ...

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

Although Seeing in the Dark doesn't directly discuss Pluto, it does celebrate the joy of observing planets. Viewers who watch the show may wonder what happened to Pluto in 2006 and whether any of ...