Why must lander probes on Mars be sterilized before launch?
A) to prevent terrestrial microbes hitching a ride on the probe and contaminating the Martian surface
B) to prevent terrestrial microbes destroying the electronics in the probe during its passage to Mars
C) to prevent Martian dust from building up on the probe on the surface
D) to prevent Martian microbes from contaminating the lander probe
Question 2
Telescopic observations of distant galaxies have shown that the universe is
A) expanding
B) contracting
C) static and unchanging
D) infinite in size
Terrestrial plants and animals can be characterized by analogous pathways for water gain and loss.
Alligators are apex predators capable of killing large terrestrial prey. This large AAmerican alliga
Phobos transits the Sun, as seen by Mars Rover Opportunity on March 10, 2004
FIRST PICTURE OF MARS
NASA in Mars
Gene therapy can prevent progression of metachromatic leukodystrophy