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
Phobos transits the Sun, as seen by Mars Rover Opportunity on March 10, 2004
Mars Rover Curiosity
The mask covers both the mouth and nose to prevent exposure to body fluids and airborne droplets.
Lachrymal probes: (A) Bowman; (B) Williams.
All brakes should be moistened with water or solvent to help prevent brake dust from becoming ...
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