Observations of the tiny irregularities in the cosmic microwave background support the idea that the Universe
A. will continue to expand forever.
B. will collapse in the distant future.
C. is composed primarily of matter, rather than antimatter.
D. contains no dark matter.
E. is composed primarily of neutrinos.
Answer: A
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The center of the Milky Way galaxy is in the direction of the constellation ____
a. Sagittarius b. Scorpius c. Orion d. Perseus e. Andromeda
A uniform electric field, with a magnitude of 500 V/m, is points in the +x direction. If the potential at is 2500 V, what is the potential at?
A) 0.50 kV B) 1.0 kV C) 2.0 kV D) 4.0 kV E) 5.0 kV
Which of the following statements about types of galaxies is not true?
A) Spiral galaxies have younger stars than elliptical galaxies. B) Among the large galaxies in the universe outside of clusters, most are spiral. C) Large elliptical galaxies are more common in clusters of galaxies than they are outside of clusters. D) Elliptical galaxies are bluer and contain more dust than spiral galaxies.
An O-star has a hotter surface temperature than the Sun. Therefore, compared to the Sun,
A) its emission peaks in the infrared part of the spectrum. B) its emission peaks in the blue part of the spectrum. C) it emits at about the same wavelengths as the Sun (similar peak) but it is much brighter. D) it emits at about the same wavelengths as the Sun (similar peak) but it is much fainter.