According to the Solar Nebula theory, planets:
A) should be randomly oriented to their star's equator.
B) will revolve opposite the star's rotation.
C) should be a common result of star formation.
D) should be extremely rare.
E) should orbit perpendicular to their star's equator.
C
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Which of the following is true of the Moon orbiting Earth?
A) The Moon orbits westward around Earth once a month. B) The Moon orbits westward around Earth once a year. C) The Moon orbits eastward around Earth once a month. D) The Moon orbits eastward around Earth once a year.
Earth's radius at the equator is larger than that at the poles. Where is Earth's surface gravity more?
A. at the equator B. at the top of Mount Everest C. at the North and South Poles D. It is the same everywhere.
During stage 3 of star formation, the dense, opaque region at the center of the cloud is called a:
A) Herbig-Haro object. B) T Tauri star. C) protostar. D) protoplanetary nebula. E) zero-age main sequence star.
The moon's acceleration is directed
A) forward, along its direction of motion. B) outward, away from Earth. C) zero. D) backward, opposite to its direction of motion. E) inward, toward the center of Earth.