One of Edwin Hubble's discoveries is that the known universe is expanding. This means that
A) most all observable galaxies are moving away from each other.
B) light rays bend as they near the event horizon of a black hole.
C) light rays undergo acceleration as they travel vast distances.
D) the mass of the universe is slowly dissipating.
A
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Which of the following describes stratospheric ozone?
A. It reflects all ultraviolet radiation back into space. B. It contributes to the increase of temperature with height in the stratosphere. C. It does not affect Earth's radiation budget. D. It reaches its highest concentrations over Antarctica in October.
Which of the following languages is not part of the Indo-European family tree?
A. Hungarian B. Celtic C. English D. Dutch
There is a limit to the intensity of hurricanes
a. true b. false
The most common gas in the atmosphere is.
A. oxygen (O2). B. nitrogen (N2). C. carbon dioxide (CO2). D. methane (CH4).