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 ...

Researchers estimate that the planet has about a 50% chance of being in its star's Hoble zone.

These icy bodies orbit the sun just like the major planets, yet they follow their own rules, often traveling along elongated ...

The curious minds at What If predict the effects if Planet X entered our solar system, revealing orbital chaos, climate ...

Life. But how would we know it? The world of astronomy is abuzz with excitement. Have we discovered the first-ever evidence of off-world life? Is the signal extracted from the interstellar noise a ...

A recent research paper suggests that a planet may exist far beyond Neptune — less than 20 years after the previous ninth planet, Pluto, was demoted. That research paper, accepted last month for ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Planetary scientists are split, oscillating between two main theories that explain the order in ...

The origin of super-Earths and sub-Neptunes has been revealed in a system of four young planets that are dramatically losing ...

When you see art of our solar system as the planet orbit the sun, you may notice that Earth's orbit has a tilt. It is not a perfect circle. What's more, Earth is not the only planet that displays such ...

LONDON — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper's authors have ...