Search/Site Selection Strategy
for
Extant Life
Might exist in
Extreme
Environ-
ment
represents an
Extinct Life
Sub-surface
Martian
Environment
may
hold
Life on
Earth
has
Essential
Require-
ments
is based on our
understanding ofu
WHAT to
Search for
flourishes
in
Include
Energy
Biogenic
Elements:
C,H,N,O,P,S
would
likely be
Micro-
organisms
require
Liquid
Water