Astronomers have discovered a comet-like object lurking near Neptune's orbit.
Neptune, the other blue planet, is the eighth planet in our solar system. Neptune is an ice giant.
Neptune may be escorted in its orbit by thousands of asteroid-like objects, perhaps more than exist in the entire asteroid belt.
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.
Three medium-sized planets of roughly the same mass as Neptune have been discovered around a nearby Sun-like star that contains an asteroid belt.
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.
The planets are likely gaseous or mixtures of ice and rock, but they might be barren rock worlds like Mercury.