Beyond the familiar planets lies a fascinating frontier filled with icy worlds, mysterious orbits, and cosmic curiosities.

Dwarf Planets NASA's New Horizons spacecraft flew past Pluto in the July 2015, snapping several photos of the dwarf planet and its giant, heart-shaped geographical feature.

A new study suggests that the dwarf planet Ceres once supplied a steady stream of chemical energy and may have been habitable.

NASA’s James Webb Space Telescope finds TRAPPIST-1 d lacks an Earth-like atmosphere, narrowing the search for habitable planets.

But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit circumnavigates the sun once every 25,000 years, taking it ...

In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

In the early 2000s the term “planet” wasn’t terribly controversial. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto all claimed that moniker.

Astronomers pointed out that the seven planets orbit TRAPPIST-1, a dwarf star that is much younger than our sun and should burn for an additional 10 trillion years — more than 700 times longer ...

Pluto, the largest of those dwarf planets, has a diameter of about 1,477 miles. Don't miss out on what's happening! Stay in touch with breaking news, as it happens, conveniently in your email inbox.