If the redshifts of quasars arise from the expansion of the universe yet they have brighter magnitudes than galaxies with the same redshifts, the quasar must
a. be very small.
b. be within the Local Group.
c. be a single star with an extremely large mass.
d. be moving toward Earth with a large radial velocity.
e. emit a very large amount of energy per second.
e
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The effect of de-forestation on the global warming problem is that
A) this makes the problem worse, because trees consume ozone from the atmosphere. B) this actually helps solve the problem, because trees consume ozone from the atmosphere. C) this actually helps solve the problem, because trees consume carbon dioxide from the atmosphere. D) this has no effect on the global heating problem, although it has harmful effects in other ways. E) this makes the problem worse, because trees consume atmospheric carbon dioxide.
Earth's magnetic field affects cosmic rays by
A) deflecting them. B) slowing their speeds. C) destroying them. D) absorbing them.
If the Moon is setting at 6 A.M., the phase of the Moon must be
A) first quarter. B) third quarter. C) full. D) new. E) waning crescent.