English Planetary surface Cited by user Nsae Comp on 01 Sep 2021 A planetary surface is where the solid (or liquid) material of the outer crust on certain types of astronomical objects contacts the atmosphere or outer space.
English Thomas Gold Cited by user Cbarlow on 13 Feb 2021 Thomas Gold was an Austrian-born American astrophysicist, a professor of astronomy at Cornell University, a member of the U.S.