Jupiter and Saturn may seem similar as gas giants, yet their vastly different moon systems reveal a deeper story shaped by ...

Jupiter and Saturn are the two largest planets in our solar system, and both are surrounded by dozens—even hundreds—of moons.

The NASA/ESA/CSA James Webb Space Telescope has provided the first direct measurements of the chemical and physical properties of a potential moon-forming disk encircling a large exoplanet. The carbon ...

A new study published in The Astronomical Journal has revealed an astonishing possibility: free-floating planets, long considered cosmic castaways, may not be as solitary as once thought. Using the ...

What is the difference between a moon and a planet? Trick question! According to scientific definitions, there often isn’t much of a difference at all. That might seem counterintuitive, but it’s true.

The two largest planets in our solar system, Jupiter and Saturn, also have the largest satellite systems, or the most moons.

Add Yahoo as a preferred source to see more of our stories on Google. This artist’s concept depicts a potential volcanic exomoon between the exoplanet WASP-49Ab, left, and its parent star.

When worlds collide…suns act squirrely. Astronomers have witnessed a rare and violent cosmic crash between two planets, and they say the fallout could teach us about the formation of our world. The ...

The deep interiors of ice giants such as Uranus and Neptune may contain a previously unknown form of matter, based on new computational research by Carnegie scientists Cong Liu and Ronald Cohen.

If NASA’s ambitious lunar exploration plans succeed, scientists will cover the moon with sensors—and find answers to several ...

When the Sun runs out of hydrogen fuel and expands into a red giant, it will eventually encompass the innermost planets of the solar system, out to about Earth’s orbit. Being closer to our enlarged ...