Pluto's orbit is tilted 17.4 degrees, compared with Earth's 1.5 degrees and Mercury's roughly 2 degrees. Pluto's unusual eccentricity and tilt is likely due to its interactions with neighboring ...

Pluto - the solar system's loneliest dwarf planet - is getting a friend... eventually. It's the New Horizons probe from NASA and it just passed Neptune's orbit. Pluto - the solar system's loneliest ...

A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than ...

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 ...

The year was 2015. After traveling billions and billions of miles through the Erebus, New Horizons encounters the boatman, and the somber lord of the departed. The spacecraft could have been called ...

Neptune’s large moon Triton may have abandoned an earlier partner to arrive in its unusual orbit around Neptune. Triton is unique among all the large moons in the solar system because it orbits ...