Narrow horizons in astrobiology.
Drake
Michael J
MJ
Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721-0092, USA.
Jakosky
Bruce M
BM
D001256:Astronomy / Q000191:economics / Q000639:trends*; D005075:Biological Evolution; D001695:Biology / Q000191:economics / Q000639:trends*; D005118:Extraterrestrial Environment; D019369:Life; D016083:Planets; D018531:Spacecraft / Q000191:economics; D014481:United States