The solar system is a grand cosmic stage where each planet and moon plays a unique role in a story billions of years in the making. From Mercury’s shrinking surface and Venus’s runaway greenhouse ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Though no direct evidence of life has been found, models suggest Ceres had hot water shooting into its underground oceans ...

Using Pluto as an example, this celestial body, once considered the ninth planet, was redefined as a dwarf planet in 2006. Its average distance from the Sun is about 5.9 billion kilometers, a distance ...

"The profile of the occultation was most consistent with it being a new satellite — a new moon — going around Quaoar." ...

For the first time since 2008, two new planets are being added to one of northern Maine's most famous — and scientifically accurate — roadside attractions. Dwarf planets Haumea and Makemake are the ...

The methane gas may constitute a rarefied atmosphere, or it may come from erupting plumes on Makemake’s surface.