Alastair G. W. (Graham Walter) Cameron, (1925-2005) was a Canadian astrophysicist and space scientist who was an eminent staff member of the Astronomy department of Harvard University. He pioneered the theory of stellar nucleosynthesis – the production of chemical elements in stars. He was also the first to advocate the formation of the Moon as a result from an extraterrestrial impact on the early Earth by an object at least the size of Mars.[1] Harvard University (incorporated as The President and Fellows of Harvard College) is a private university in Cambridge, Massachusetts, USA and a member of the Ivy League. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... Adjectives: Martian Atmosphere Surface pressure: 0. ...