Most of the hot, young blue stars lie in the ________ of our Galaxy
A) bulge
B) globular clusters
C) central bar
D) spiral arms
E) halo
D
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The Big Bang theory is supported by two major lines of evidence that alternative models have not successfully explained. What are they?
A) (1) the existence and specific characteristics of the observed cosmic microwave background (2) the observed overall chemical composition of the universe B) (1) the early universe was hot and dense (2) we see distant galaxies as they were in the distant past C) (1) the episode of inflation thought to have occurred in the early universe (2) the separation of gravity and the other forces at the end of the Planck era D) (1) the universe is expanding (2) the observed ratio of spiral to elliptical galaxies in the universe
When uranium emits a beta particle, the result is
A) a uranium ion. B) a different isotope of uranium. C) the first transuranic element. D) all of the above E) none of the above
When polyethylene is melted, the only bonds that are broken are the weak ______________ bonds between the long-chain molecules.
Fill in the blank(s) with the appropriate word(s).
A planet is detected via the Doppler technique. The velocity change of the star is a measure of
A) the planet's size and density. B) the planet's mass and orbital distance. C) the planet's mass and composition. D) the planet's orbital period and eccentricity. E) the planet's size and orbital distance.