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We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves ...

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We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves ...

We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves with no Doppler shift. Each of the following is a possible explanation, except one. Which is the exception?
A)   The neutral hydrogen in this region is not moving relative to the Earth.
B)   The neutral hydrogen in this region is moving perpendicularly across our line of sight.
C)   The neutral hydrogen in this region is in a circular orbit around the galactic center at the same radius as the solar system.
D)   The neutral hydrogen in this region is moving away from us instead of toward us.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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doit_the_clown Author

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7 years ago

Thanks for your help!!

nadiia

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This helped my grade so much Perfect

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