Lo mhlaba ogama lakhe linguGJ 504B wakhiwa igesi epinki. Kuyafana neJupiter, iplanethi enkulu kagesi ngohlelo lwethu lweSolar. Kepha i-GJ 504B ine-massive ephindwe kane. Ku-460 degrees Fahrenheit, izinga lokushisa le-oveni elishisayo, futhi kungukushisa okukhulu kweplanethi ebenza kukhanye.