Neptune

Neptune is much too faint to be perceived without any optical aid.

There could be an explanation for the accelerating expansion of the universe even weirder than dark energy.

Neptune's warmer south pole responsible for methane hot spots.

A cluster of massive grey space boulders floating in the outskirts of the Solar System are the remnants of an ancient collision involving two rocky objects, one of which was nearly the size of Pluto.

Neptune may be escorted in its orbit by thousands of asteroid-like objects, perhaps more than exist in the entire asteroid belt.

Scientists have identified 58 objects smaller than 100 meters across using a novel technique.

Three new rocky bodies have been detected in the same orbit as Neptune, bringing the total number of the gas giant's asteroid companions, or "Trojans," up to four.

Neptune's largest moon, Triton, was originally a member of a duo orbiting the Sun and was kidnapped in a close encounter with Neptune, a new model suggests.

Astronomer have discovered a planet about as massive as Neptune orbiting one of the most common types of stars in the universe.