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We observe a glowing cloud of gas in space with a spectroscope. We note that many of the familiar lines of hydrogen that we know on Earth seem to be in a different place. They are shifted toward the blue or violet end of the spectrum compared to their positions in the spectrum of glowing hydrogen gas on Earth. From this we can conclude that:Athe cloud is much hotter than hydrogen on EarthBthe cloud is much cooler than hydrogen on EarthCthe cloud is moving toward usDthe cloud is moving away from usEnone of the above can be concluded from this observation.

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