The Moon has no sustained atmosphere. What advantages would you have if you built an observatory on the lunar surface?
What will be an ideal response?
All wavelengths of light could be observed. There would be no atmospheric distortion and light pollution. We could observe during the daytime.
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Why is the ozone layer in Earth's atmosphere important to life on its surface?
What will be an ideal response?
The structural region of Earth that is a viscous liquid is the
a. mantle. b. outer core. c. inner core. d. lithosphere.
Multiple-Object Accelerating Systems: The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very light. 
A. 16 kg B. 14 kg C. 13 kg D. 11 kg
What did the Voyager mission discover about the main rings of Saturn?
A) There are hundreds of small moons in the ring system. B) They were less dense than the rings of Jupiter. C) There are several small moons inside the inner-most ring. D) The ring system is much thicker than originally believed. E) They are composed of tens of thousands of narrow ringlets.