Suppose you repeated the famous COBE and Planck observations of the cosmic microwave background, with a slight different observational setup, to check their results. Which of the following observations would be surprising and contradict earlier findings?

A) You find that cosmic microwave background has a temperature of 2.73 K.
B) You find that cosmic microwave background has an almost perfect thermal spectrum.
C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium.
D) You find that cosmic microwave background looks essentially the same in all directions.
E) You find that cosmic microwave background has tiny temperature fluctuations at the level of about 1 part in 100,000.


C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium.

Physics & Space Science

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Why is January a cold month in the northern United States?

A) Earth is near its farthest point from the sun. B) There's more snow in January. C) The northern hemisphere is farther from the sun than the southern hemisphere. D) The northern hemisphere is tilted away from the sun.

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In stellar astronomy, _____ states that the weight of each layer of a star must be supported by the layer below

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