A new study, however, identifies a possible candidate. A separate team of astronomers compared 1983 data from the Infrared ...

Planet Nine (or Planet X as NASA calls it ... An arcminute is used by scientists to measure angles in the sky, like how far apart things appear when you look up. There are 60 arcminutes in a degree ...

For years, astronomers have toyed with the idea that the Sun hides an extra planet so distant and dim that even the best ...

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, dubbed Planet Nine, could explain the unusual clustering ...

along with dwarf planets like Pluto, dozens of moons, and millions of asteroids and comets. The planets orbit the sun in elliptical paths, with the inner four being rocky terrestrial worlds and ...

They were looking for distant objects that moved slowly between one set of data and the next, like the proposed ... camera ...

along with dwarf planets like Pluto, moons, and millions of asteroids. The hypothetical Planet Nine is said to orbit about 20 to 30 times farther from the Sun than Neptune, taking between 10,000 ...

That will allow the observatory to detect anything that changes — like, say, Planet Nine moving across the sky. "If it's there, we should be able to find it, pretty easily," says Blum.