What is the most significant drawback of possibly sending humans to Mars?
A) the fact that there would be no possible source of water on the surface
B) the high probability of contamination of the Martian surface by microbes associated with human beings
C) the high probability of Martian microbes contamination of contaminating the crew
D) the fact that astronauts could not breathe in the Martian atmosphere
B
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The intensity level of sound 30 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)
a. 60 m c. 300 m b. 90 m d. 400 m
Describe the seafloor spreading theory
What will be an ideal response?
Compared to a 5-inch prime focus reflector, a 5-inch Newtonian reflector will
A) have the same light gathering power. B) have more light gathering power. C) have more chromatic aberration. D) be easier to build. E) have a larger hole in the center of its mirror.
Local climate patterns in a cooler world may involve more rainfall
What will be an ideal response?