All know forms of life on Earth use _______ as a medium for chemical reactions
a. gaseous helium
b. gaseous helium
c. frozen carbon dioxide
d. liquid water
e. frozen water
D
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The luminosity of a star is the total amount of energy it radiates each second
a. True b. False Indicate whether the statement is true or false
Which properties of spiral galaxies allow us to subclassify them as Sa, Sb, or Sc?
A) orientation B) size of the disk C) shape of the halo D) size of bulge and extent of spiral arms E) color of stars in the disk
The mass range for neutron stars is
A) 0.08 to 0.4 solar masses. B) 0.4 to 3 solar masses. C) 1.4 to 3 solar masses. D) 3 to 8 solar masses. E) 6 to 11 solar masses.
If all the "dark matter" in our universe were to be instantaneously removed, which of the following would not happen?
A) The Milky Way would fly apart. B) Clusters of galaxies would fly apart. C) The universe would expand forever. D) The Solar System would fly apart. E) All of the above