Carbon dioxide has been detected on a planet outside our solar system for the first time. The gas has been observed directly by the James Webb Space Telescope on four exoplanets, all belonging to the ...

It was almost 100 years ago that Clyde W. Tombaugh discovered Pluto. That was the last planet found until 1992, when humans found another one. But this new planet wasn't in our solar system—it was ...

Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system ...

Alpha Centauri, one of the two "Pointer Stars" that help stargazers find the Southern Cross in the Southern Hemisphere, may have a planet in orbit around it. If it does, the Webb Telescope will find ...

Five new exoplanets have been discovered—each of them so young, they are still growing. The baby planets were discovered by researchers in the midst of an international planet hunt, using a new ...

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 ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it. Some astronomers ...

"It's like trying to spot a fish by looking for ripples in a pond, rather than trying to see the fish itself." When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

A rogue planet some 600 light-years away has been going through a growth spurt, gobbling up gas and dust at a rate of 6 billion metric tons per second, researchers report in the Oct. 10 Astrophysical ...

The Solar System does not have a clear border. The influence of the Sun in certain domains is small enough for the Voyager probes to have escaped into interstellar space, but there are comets and ...