Escape speed from Mars is
A) about the same as from Earth.
B) greater than from Earth.
C) less than from Earth.
Answer: C
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As a Sun-like main-sequence star exhausts hydrogen in its core, it next becomes
a. a protostar. b. a red giant star. c. a white dwarf star.
What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee B) Full Moon on ecliptic at perihelion C) New Moon on ecliptic at perigee D) New Moon on equator at apogee E) New Moon on ecliptic at apogee
The lens of a slide projector has a focal length of 10.0 cm. It is used to project the image of a 35 mm slide 
on a square screen located 6.0 m away. Of the following screen widths, which is the smallest that would allow the image to fit?
A. 5.1 m B. 4.4 m C. 2.2 m D. 1.1 m E. 0.88 m
The largest difference between Mars' northern and southern hemispheres is that:
A) the southern appears older, with more impact craters. B) the northern has all the outflows and must have been much hotter. C) the northern is higher overall, despite some high volcanoes in the south. D) the southern has a polar cap, but none ever forms in the north. E) the southern is much darker, with large mare-like basaltic lava flows.