Planets without stars to orbit raise important questions about how planets evolve and what habitability might look like ...

The solar system's smallest planet has gotten smaller still.

Forty light-years away sits a scorched world that once earned one of astronomy’s most dazzling nicknames: the diamond planet. The idea that a super-Earth might be built largely of carbon, with ...

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Everyone gets wrinkles eventually—even planets. On Mercury, these signs of aging look like hills and ridges, called ...

Forbes contributors publish independent expert analyses and insights. Leslie Katz covers the intersection of culture, science and tech. A yellowish-orange glow bathes Phainoterra, a planet of dramatic ...

Astronomers have found evidence of a process that supports an alternative, more rapid approach to planetary formation, more top down than bottom up. By Katrina Miller When it comes to making a planet, ...

About 4.6 billion years ago, a celestial cloud collapsed, paving the way for our solar system to form. Then, a nebula with strong gravitational pull took shape, kick-starting the birth of the sun. But ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A “planet parade ...

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A rogue planet some 600 light-years away has been going through a growth spurt, gobbling up gas and dust at a rate of 6 billion metric tons per second, researchers report in the Oct. 10 Astrophysical ...