Cosmic Ray Impact on Extrasolar Earth-Like Planets in Close-in Habitable Zones Grießmeier, J. -M. ; Stadelmann, A. ; Motschmann, U. ; Belisheva, N. K. ; Lammer, H. ; Biernat, H. K. Abstract Publication: Astrobiology Pub Date: October 2005 DOI: 10.1089/ast.2005.5.587 Bibcode: 2005AsBio...5..587G