How does the study of quasars reveal information of the history of the universe?
a. Typical quasars are very distant so we can view how galaxy evolution occurred in the past.
b. Quasars contain stars of all ages.
c. Quasars typically act as host galaxies for gravitational lensing.
d. Quasars generate their energy in very small volumes of space
A
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The asymmetrical surface markings on some of Saturn's moons are probably due to:
A) all of the moons are located within the rings and they sweep up ring particles. B) the moons of Saturn are made primarily of ices. C) in most cases, the moons are tidally locked by Saturn's gravity into synchronous rotation. D) comet impacts become progressively harder as you get closer to Saturn. E) most of the moons show signs of ice volcanism driven by tidal interactions.
There are no auroras on Venus because it
A) is too hot. B) lacks atmospheric oxygen. C) lacks a strong magnetic field. D) lacks strong winds.
The kinetic energy of a particle is 3 times its rest energy. What is the speed of the particle?
A) 0.950c B) 0.968c C) 0.976c D) 0.984c E) 0.990c
When one of the authors was a teenager, the rate of rotation for popular music records on a record player was 45 RPM.
a. Express this rotational velocity in rev/s.