The study of eclipsing binary star systems provides information about the radii of stars.
Answer the following statement true (T) or false (F)
True
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The planet with the largest volcano in the solar system is
a. Earth. b. Mars. c. Venus. d. Mercury.
The half-life of 3H is 12 years. About how long does it take for 7/8 of a sample of that radionuclide to decay?
a. 3 years b. 24 years c. 4 years d. 36 years
What do we mean by the singularity of a black hole?
A) There are no binary black holes—each one is isolated. B) An object can become a black hole only once, and a black hole cannot evolve into anything else. C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. D) It is the edge of the black hole, where one could leave the observable universe. E) It is the "point of no return" of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole.
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is:
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.