Now, in a new yet-to-be-peer-reviewed paper, an international team of astronomers analyzed data collected by the European ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.

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 ...

NASA scientists have confirmed that a mysterious object shooting toward us through the solar system is an "interstellar object" — only the third of its kind ever seen. Experts have also given the ...

IMAP mission will explore our solar system's protective heliosphere and will also help us develop a better understanding of ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s hiding in plain ...