According to cosmic inflation theory, the distribution of galaxies we see today is a consequence of
A) the evolution of dark matter.
B) quantum fluctuations in the exceedingly small early universe.
C) random expansion.
D) some force yet to be identified.
Answer: B
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The interior layer just below the crust of Earth is called the ________.
A. inner core B. mantle C. troposphere D. outer core
A key clue to how the solar system formed is the observation that all the planets orbit close to the same plane
Indicate whether the statement is true or false
In the Doppler effect, a redshift of spectral lines shows us the source is receding from us
Indicate whether the statement is true or false
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
a. 0; 0. b. 0; 2.38 m/s, south. c. 0; 2.38 m/s, north. d. 1 000 m, south; 2.38 m/s, south. e. 1 000 m, north; 2.38 m/s, north.