The discovery of four moons in orbit about Jupiter by Galileo suggested that
A) the Earth moved about Jupiter
B) the Earth moved about the Sun
C) Jupiter moved about the Sun
D) bodies could stay in orbit about a moving Jupiter
D
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Spherical Mirrors: An object is placed in front of a convex mirror at a distance larger than twice the magnitude of the focal length of the mirror. The image will appear
A. in front of the mirror. B. inverted and reduced. C. inverted and enlarged. D. upright and reduced. E. upright and enlarged.
How are galaxies important to our existence?
A) Without galaxies, there could not have been a Big Bang. B) Without galaxies, the universe could not be expanding. C) Deep in their centers, galaxies created the elements from which we are made. D) Galaxies recycle material from one generation of stars to the next, and without this recycling, we could not exist.
Which of the following statements about the asteroid belt is not true?
A) The combined mass of all the asteroids is roughly the same as the mass of Earth. B) It is located between the orbits of Mars and Jupiter. C) Asteroids in the asteroid belt orbit the Sun in the same direction that planets orbit the Sun. D) Asteroids in the asteroid belt are made mostly of rock.
To date, our serious searches for extraterrestrial life have been done almost entirely:
A) in Roswell and Gulf Breeze. B) with radio telescopes. C) with optical telescopes looking for nuclear tests. D) with microwaves in the giant molecular clouds. E) with infrared telescopes looking for greenhouse gases.