The status of Pluto not withstanding, our solar system has 8 planets, but one astronomer believes we used to have a ninth ...

A TEAM of astrophysicists have made a bombshell scientific discovery after detecting a radio signal coming from beyond the ...

It's a first in scientific history. The post Harvard Scientists Detect Radio Signal Coming Directly From Planet Outside the ...

For the first time, astronomers have detected radio signals from a planet beyond our solar system, according to a study ...

Thousands of planets have been discovered beyond our solar system, offering clues to where life might thrive and whether ...

Ancient iron meteorites reveal that some of the Solar System’s first solid bodies were built mostly from tiny heat-forged rock beads called chondrules, while water-rich dust was largely excluded. The ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A leading scientist has told Newsweek about new evidence supporting 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 ...

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

There’s less Mercury in the system. Scientists found that Mercury, the solar system’s smallest planet, is shrinking far faster than previously believed, offering a never-before-seen window into the ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...