Active galaxy is a galaxy:
A) whose center emits large amounts of excess energy.
B) whose center does not have a black hole.
C) that is in the process of merging with another galaxy.
D) that manifests a blueshift instead of a redshift.
A
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A total solar eclipse occurred in Wolf Point, Montana on Feb. 26, 1979 . When was (will) this eclipse again (be) visible in Montana?
a. August of 1979 b. March of 2033 c. March of 1997 d. March of 1979 e. January of 2000
Study this H-R diagram. What is the spectral type of the star Sirius? (The red arrow helps you locate Sirius on the diagram.)
A) A B) 102 C) main sequence D) blue
If the Sun were replaced by a one-solar-mass black hole,
A) we would immediately escape into deep space, driven out by its radiation. B) all terrestrial planets would fall in immediately. C) our clocks would all stop. D) we would still orbit it in a period of one year. E) life here would be unchanged.
The variation of the speed of light in a transparent medium with frequency results in
a. interference b. diffraction c. dispersion d. diffuse reflection e. polarization