We aim our radio telescope at a distant region of the Milky Way Galaxy and detect 21-cm radio waves with no Doppler shift.Which possible explanation is NOT correct?
A) The neutral hydrogen in this region is not moving relative to 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 Earth instead of toward Earth.
Correct Answer:
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