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
The 15 terrestrial ecozones in Canada.
2008 launch of the SM-3 missile used to destroy American spy satellite USA-193
Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth
Sunlight on Mars is dimmer than on Earth. This photo of a Martian sunset was imaged by Mars Pathfind
PPE used to prevent exposure to bloodborne pathogens.
Similar Rock Outcrops on Mars and Earth