Some of the cores capture massive atmosphere to form gaseous giants. (alma-telescope.jp)
That old knowledge has been forgotten but is found as a residual assumptions in various locations such as the NASA work on terraforming Mars which relies on a more massive atmosphere to raise surface temperatures rather than more GHGs. (wattsupwiththat.com)
In the hours before Cassini becomes a miniscule spark spiraling into Saturn's massive atmosphere, one of its final tasks will be capturing and sending back images of its most cherished targets: Titan and its methano - logical weather; Enceladus and its watery plumage setting behind Saturn's northern rim; a moonlet nicknamed «Peggy» being born at the edge of a ring; and a family portrait of the planet and its rings. (scientificamerican.com)