JWST study links sulfur rich gas giants to core growth in distant HR 8799 system
Gas giants are large planets composed mainly of hydrogen and helium with dense cores but no solid surfaces. Astronomers have long debated how the most massive of these worlds form and where the boundary lies between true planets and brown dwarfs. A new investigation of the HR 8799 planetary system using the James Webb Space Telescope provides key evidence that even very massive gas giants can gr