Mysterious out-of-this world Ultima Thule is a billion miles beyond Pluto, 4 billion miles from Earth.
The New Horizons probe is hurtling toward an object nicknamed Ultima Thule in the mostly unexplored Kuiper Belt.
Hey there, lil fella!
Michael E. Brown, a researcher in planetary astronomy at Caltech is a servant of the 24th letter in the English alphabet, forever searching for the next big body in the Solar System, the yearned planet 'X'.
The planet -- which would have been our solar system's fifth giant -- had a bumpy ride on its way out, scientists say.
The missing planet bumped into Neptune before disappearing into the abyss of space, according to a new study.
Now that it's sailed beyond Pluto, what comes next for NASA' s New Horizons spacecraft? NASA says the probe will continue
Fomalhaut's comet belt arrangement is similar to the Kuiper belt of icy objects beyond the orbit of Neptune in our own solar
There's probably no intelligent life in the outer solar system. But it couldn't hurt to check. "Forthcoming facilities might
Scientists at NASA's Goddard Space Flight Center used the Discover supercomputer to create a simulation of our solar system
In 2000, astrophysicist Neil deGrasse Tyson, director of the Hayden Planetarium (and People's Sexiest Astrophysicist Alive), downsized Pluto from a super-cute planet to a tiny, icy body.