Which best describes the appearance of an asteroid?
a. spherical in shape and covered with craters
b. spherical in shape with a volcanic surface
c. irregular in shape and covered with craters
d. irregular in shape with a volcanic surface
e. spherical in shape and smooth, dusty surface
c
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What are giant molecular clouds?
a. Cocoons of dust around young protostars, containing giant molecules such as C3H8 and C6H12O6
b. Dark interstellar globules of up to about 30 light-years across and containing a few thousand solar masses of material
c. Bright clouds up to about 100 light-years across surrounding hot, young stars, and glowing with reddish H? emission
d. Star-formation regions of up to about 300 light-years across and containing about a million solar masses of material
Size of the Nucleus: Calculate the estimated density of the nucleus of 
Sr? (mneutron ? mproton = 1.67 × 10-27 kg)
A. greater than 3.0 × 1020 kg/m3 B. 90 kg/m3 C. 2.1 × 1019 kg/m3 D. 2.0 × 1015 kg/m3 E. 2.3 × 1017 kg/m3
Solar-type stars in our galaxy are
A) very common, making up about 50% of the total B) very rare (less than 1%) C) fairly common (several percent) D) the most common type of stars in our galaxy (75% or more)
A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a:
A) day. B) week. C) month. D) year. E) century.