The time between equinoxes on Uranus is about:
A) 7 hours.
B) 8 hours.
C) 21 years.
D) 42 years.
E) 84 years.
D
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The narrowness of the rings of Uranus and Neptune is believed to be caused by
a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. the smaller mass of Uranus and Neptune as compared to that of Saturn. e. small shepherd moons that orbit near the rings.
The Sun is at one focus of the elliptical orbit of the Earth around the Sun. What is at the other focus?
A. Nothing. B. Jupiter. C. The Moon. D. The Earth. E. Mars.
Most comets spend the majority of their time beyond the orbit of ________, yet many of them have perihelions very close to the Sun
Fill in the blank(s) with correct word
Two emerging beams of light produced by a birefringent crystal
A) are at different frequencies. B) will produce an interference pattern when recombined. C) are polarized in the same direction. D) are polarized in mutually perpendicular directions. E) are at 90° with respect to one another.