The oldest rocks found on Earth are about ____ years old

a. 14 billion
b. 10.5 billion
c. 7.0 billion
d. 3.9 billion


D

Physics & Space Science

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Type II supernova spectra are poor in hydrogen because stars that explode this way use up all their hydrogen before they leave the main sequence

Indicate whether the statement is true or false

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A pre-electronic thermostat employs a coiled

A) wire of low conductivity. B) bimetallic strip. C) tube of mercury.

Physics & Space Science

Einstein's equivalence principle says that

A) everyone measures the speed of light to be equivalent. B) the effects of gravity are exactly equivalent to the effects of acceleration. C) someone traveling at 0.9c will age at the same rate as someone at 0.99c. D) all people see themselves at an equivalent distance to the center of the universe.

Physics & Space Science

Briefly explain why radiation was trapped for 300,000 years during the era of nuclei, and why the cosmic background radiation broke free at the end of this era

What will be an ideal response?

Physics & Space Science