Moonquakes are believed to have caused the Moon's
a. rays.
b. craters.
c. rills
d. plains (maria).
c
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Brian is working on a project that involves astronomical calculations. The numbers involved in the calculations are very large, and the calculations require him to write too many zeros. Which of the following methods should Brian use to express the numbers without writing a great many zeros?
A) Theoretical notation B) The octal numeral system C) The binary number system D) Scientific notation
Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.
The property of response to the environment appears to be
A) a necessary condition, but not a sufficient condition for life B) a sufficient condition, but not a necessary condition for life C) both a necessary condition and a sufficient condition for life D) neither a necessary condition nor a sufficient condition for life
Most radio galaxies belong to Hubble's class ________
Fill in the blank(s) with correct word