Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

Astronomers have found a unique solar system with six planets moving in harmony, untouched by outside forces since their creation billions of years ago. This discovery, announced on Wednesday, could ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

Venus, Mercury, Saturn, Jupiter and Mars can all currently be seen in that order with the naked eye, starting from the southwestern horizon and moving east. However, Uranus, located between Mars and ...

Just two decades after astronomers discovered the first exoplanet, NASA has confirmed the existence of 6,000 alien worlds. The total will rise even quicker as next-generation telescopes take flight.

"Free-floating planets with mass strictly greater than that of Mars may exist in the outer solar system' NEW research claims five extra rocky planets could exist on the edge of our Solar System.

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find, announced ...

Astronomers have found new evidence that a mysterious ninth planet may be hiding at the edge of the solar system - rewriting what we know about the cosmos again. An international team from Taiwan, ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system? When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

Watch this video to find out more about the Earth, planets in our Solar System and other planets far off in outer space. From up here on the International Space Station I get a great view of Earth.