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

Physics & Space Science

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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

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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

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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

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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.

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