skyandtelescope.com • JANUARY 2020 35
Discoveries of life deep beneath
Earth’s surface are provoking scientists
to wonder what might hide in the
subsurface world of Mars.
NIC
OL
LE
R.
FU
LL
ER
/^ S
AY
O-
AR
T^ L
LC
skyandtelescope.com • JANUARY 2020 35
Discoveries of life deep beneath
Earth’s surface are provoking scientists
to wonder what might hide in the
subsurface world of Mars.
NIC
OL
LE
R.
FU
LL
ER
/^ S
AY
O-
AR
T^ L
LC