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
NASA STS-121 Launch
Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth
Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol
Paths of Mars
All oily shop cloths should be stored in a metal container equipped with a lid to help prevent ...
Mars using Google