Key takeawaysIf a gas giant planet is big enough to ignite deuterium fusion, it becomes a brown dwarf instead of a planet.

If a gas giant planet is big enough to ignite deuterium fusion, it becomes a brown dwarf instead of a planet. But this definition is incomplete and does not tell us how gas giants form or what ...

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

A planet that looks faintly familiar has emerged from old space telescope data, though it may be far from welcoming. Scientists analysing observations.

The planet's radius from pole to center has been revised to 66,842 km, and at the equator to 71,488 km. That makes it about ...

They show up as a mathematical solution in general relativity, basically as a time-reversed version of a black hole. Some ...

Jupiter has just been put on a cosmic diet. New measurements led by an Israeli team show that the giant planet’s diameter is about 8 kilometers smaller than long‑standing estimates and that its poles ...

The James Webb Space Telescope has detected the first-ever spectral signature of hydrogen sulfide around a massive gas giant planet.

NASA describes deep hydrogen compression that eventually forms conductive metallic liquid, making Jupiter feel less like Earth and more like a continuous gradient of states. That alone breaks the old ...

Detection of hydrogen sulfide in four HR 8799 gas giants provides evidence of solid accretion, clarifying how massive exoplanets form and distinguishing them from brown dwarfs ...

"We've often seen the 'baby pictures' of planets forming, but until now, the 'teenage years' have been a missing link." When you purchase through links on our site, we may earn an affiliate commission ...

To capture higher-definition and sharper images of cosmological objects, astronomers sometimes combine the data collected by ...