The unusually bright centers found in some galaxies are called ________
A) halos B) active galactic nuclei
C) starbursts D) supermassive black holes
B
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Describe how we know that the expansion rate of the Universe is currently accelerating
What will be an ideal response?
Determine the equivalent capacitance of the combination shown when C = 15 mF.
A. 20 mF B. 16 mF C. 12 mF D. 24 mF E. 75 mF
Kinetic Energy: The special theory of relativity predicts that there is an upper limit to the speed of an object. It therefore follows that there is also an upper limit on which of the following properties of the object? (There could be more than one correct choice.)
A. The kinetic energy of the object. B. The total energy of the object. C. The linear momentum of the object. D. None of these.
During a star's main sequence portion of its life it does not change size appreciably. This observation indicates that
A. the Sun produces about the same amount of energy as it radiates into space. B. the Sun produces less energy than it radiates into space. C. the Sun produces more energy than it radiates into space.