Agence France-Presse: Scientists have uncovered an ancient ecosystem below an Antarctic glacier that survived millions of years in cold brine without light or oxygen, a study said. Because the ecosystem was isolated for so long in extreme conditions, it could shed light on possible extraterrestrial life and how systems can survive under ice, said longtime Antarctic researcher and Montana State University professor John Priscu, a co-author of the study. A thick ice crust has formed on Mars and …