Pluto is a bit of a loner. The dwarf planet is no longer considered a regular planet; it does not orbit on the same plane as the solar system's eight planets; and its orbit is both highly elliptical ...

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...

While the James Webb Space Telescope looks for the most distant galaxies ever seen, astronomers have discovered something new in our very own solar system. Researchers from the U.S. and Canada have ...

It circles the sun in an elongated and tilted orbit. For about 20 percent of its 248-year journey around the sun, it is within the orbit of Neptune. At its farthest distance it is nearly 50 times the ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...