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
On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major
Mars Rover Curiosity
Map of Mars Locations
Dry hands and forearms thoroughly with clean paper towels to prevent chapping.
Keeping a Salad Dressing Blended To prevent the fat from separating out in a salad dressing
Can gene therapy be used to cure patients with HIV infections or to prevent HIV infections?