Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

Gas giants are massive worlds made mostly of hydrogen and helium. They lack solid surfaces, and in our solar system, Jupiter ...

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don’t ...

The discovery provides new insights into the question, 'how large can a planet be?' An illustration of the HR 8799 system with three of its gas ...

Jupiter has just been put on a cosmic diet. New measurements led by an Israeli team show that the giant planet’s diameter is ...

Relatedly, astronomers may have just pushed the upper size limit of what counts as a planet.

Updated measurements from NASA’s Juno spacecraft could help researchers better understand the planet's mysterious interior, ...

Astronomers have found strong evidence of a giant gas planet orbiting a star in a solar system close to our own sun. Four light-years away from Earth, the Alpha Centauri triple-star system has long ...

A new discovery suggests the possibility of an exomoon with an unprecedentedly large mass, thousands of times larger than any moon in our Solar System.

Hubble observations reveal a giant, turbulent planet-forming disk that may reshape theories of how planetary systems develop.

Aging stars can completely destroy their planets. When a star reaches the end of its life on the main sequence, it goes ...