We usually think of satellites as small objects orbiting planets or stars. But in the broader universe, galaxies themselves ...

A bizarre planet defies cosmic norms: scientists have confirmed a giant planet orbiting in reverse around one star in a close ...

Dwarf planets Haumea and Makemake are the latest additions to the Maine Solar System Model, billed as the largest solar ...

Ever since the International Astronomical Union recognized Haumea and Makemake as dwarf planets in 2008, University of Maine ...

Uncover fascinating and lesser-known facts about our solar system! Discover why you can't stand on Uranus, which moon has ...

The Kuiper Belt is a distant, icy region of our solar system filled with secrets, dwarf planets, and cosmic surprises.

Pluto was once known as the ninth planet but was reclassified after scientists set clear criteria for planets. The key factor ...

A Dartmouth-led study identifies potentially more that 300 small galaxies orbiting low-mass systems known as dwarf ...

Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the ...

Giant, ridge-like structures of methane ice, known as "bladed terrain," may be much more abundant along Pluto's equator than ...

Researchers studied the L 98-59 system and confirmed five rocky planets. One is in the habitable zone and may support liquid water.