There's a whole slew of objects that astronomers aren't sure whether to classify as "failed stars" or "overgrown planets." ...

New images of Uranus show the planet in blue, the upper atmosphere in red, auroras in lighter red spots and rings in white. ESA / Webb, NASA, CSA, STScI, P. Tiranti, H. Melin, M. Zamani (ESA / Webb) ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. This image of Pluto was made after the New Horizons spacecraft flew past the dwarf planet on July ...

Since the discovery of exoplanets, a planet that orbits stars outside the solar system, astronomers and scientists have been astounded by the strange characteristics of these extrasolar planets. To ...

A strange 200 million-year-old object with the mass of a planet has been discovered 20 light-years from Earth, outside our solar system. The "rogue," as it's referred to by researchers, is producing ...

A mysterious "rogue" planet has been observed gobbling six billion tonnes of gas and dust a second -- an unprecedented rate that blurs the line between planets and stars, astronomers said Thursday.

Pluto is a bit of a loner. The dwarf planet is no longer considered a regular planet; it does not orbit on the same plane as the solar system's eight planets; and its orbit is both highly elliptical ...