Which hypothetical universe will eventually contract, if there were no dark energy?
A) the universe with 1.5 times the critical density of matter
B) the universe with 1.0 times the critical density of matter
C) the universe with 0.5 times the critical density of matter
A
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Who discovered Uranus?
a. Galileo Galilei b. William Herschel c. John Couch Adams d. Urbain Le Verrier e. Clyde Tombaugh
Molecular Speeds: Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
A. four times faster than the hydrogen molecules.
B. at 1/4 the speed of the hydrogen molecules.
C. sixteen times faster than the hydrogen molecules.
D. at 1/16 the speed of the hydrogen molecules.
E. at 1/
the speed of the hydrogen molecules.
The kind of waves that travel fastest through a long metal rod have
A) short wavelengths. B) waves of medium length. C) long wavelengths. D) all have the same speed
The Galactic center in ________ is best studied using radio and infrared observations
Fill in the blank(s) with correct word