Astronomers have predicted how big this hypothetical world could be, how far away it could lie and even where it should be in ...

In 2015, two astronomers from Caltech presented evidence that six objects past the orbit of Neptune were bunched ... better than in simulations where planet 9 was not included.

SpaceX launched the private Fram2 mission Monday (March 31), sending a crew of four spaceflight rookies into an orbit never ...

Known as Planet Nine or Planet X, it is a hypothetical planet ... the BBC as a "doughnut shaped region of icy bodies" beyond the orbit of Neptune – that had unusually warped orbits around ...

Planet Nine, a massive icy world, may be lurking at the outer edge of our solar system, awaiting discovery by advanced telescopes. "It's really difficult to explain the solar system without Planet ...

Fram2 is set to launch as early as March 31, sending four first-time astronauts into an orbit never before visited by humans.

Nine in 10 useful satellites are located in an area called low Earth orbit — as is most of the junk. Objects in this zone move at about 17,000 miles per hour, making it hard to avoid collision.

“When compared to our solar system, each of the four planets are inside the distance of Mercury’s orbit,” Basant said. The planets closely orbit Barnard’s Star, zipping around their ...