Which will reach the bottom last?
A. A solid ball
B. A hollow ball
C. A cylinder
D. A piece of pipe
E. We need to know the radius and mass of each.
D. A piece of pipe
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Stars less massive than about 0.4 solar mass are referred to as _____
A) brown dwarfs B) red dwarfs C) yellow dwarfs D) white dwarfs
The chemical abundance of population I stars
a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.
The Doppler method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
What is the purpose of interferometry?
A) It allows two or more small telescopes to achieve the angular resolution of a much larger telescope. B) It allows two or more small telescopes to achieve a larger light-collecting area than they would have independently. C) It is designed to prevent light pollution from interfering with astronomical observations. D) It reduces the twinkling of stars caused by atmospheric turbulence.