What started as a mysterious red dot in images taken by University of Arizona astronomers has been confirmed as a huge, newly forming planet.

Astronomers have confirmed a new planet in one of the youngest solar systems ever found, thanks to University of Arizona ...

Surprise, it's twins.

Exoplanet L98-59d, located far beyond our solar system, might not sound like someone’s dream destination. It likely has an ...

Theories around the formation of Earth have just been challenged by researchers from ETH Zurich. For a long time, the general ...

For years, planetary scientists have argued that some of the material that built Earth must have drifted in from beyond ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The solar system suddenly has a new member. A new object ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a cold, desert world within our solar system. It has a very thin atmosphere, but ...

Earth is the planet we have the best opportunity to understand in detail—helping us see how other rocky planets behave, even ...