In astronomy, an interferometer can be used to:
A) yield better seeing conditions with optical telescopes.
B) decrease the effects of light pollution in getting darker sky backgrounds.
C) improve the angular resolution of radio telescopes.
D) increase the sensitivity of infrared telescopes to longer wavelengths.
E) speed up the processing of CCD images.
C
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Nuclear power plants on Earth generate energy through _____
A) nuclear fission reactions B) nuclear fusion reactions C) nuclear convection reactions D) nuclear evaporation reactions
A(n) ____ is well supported (observationally and/or experimentally) system of rules and principles that can be applied to a wide variety of circumstances but that is not universally accepted
a. hypothesis b. paradigm c. theory d. model
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is the youngest?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. C) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.