Visible light is an example of
A) a compression wave
B) an electromagnetic wave
C) a seismic wave
D) a gravitational wave
B
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How long is one Hubble time?
a. 1/4 the age of the Universe b. 1/2 the age of the Universe c. the age of the Universe d. double the age of the Universe
Which of the following is the most common type of main-sequence star?
A) an O star B) an A star C) an F star D) an M star E) a G star
A galaxy's spectrum has a redshift of 30,000 kilometers per second. If the Hubble constant is 75 kilometers per second per megaparsec, how far away from Earth is the galaxy?
A. 1,000 megaparsecs B. 106 megaparsecs C. 400 megaparsecs D. 20 megaparsecs E. 50 megaparsecs
A teaspoonful of neutron star material on Earth would weigh
A) about the same as a teaspoonful of Earth-like material. B) a few tons. C) more than Mt. Everest. D) more than the Moon. E) more than Earth.