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21 January, 18:38

Even though the hubble law for galactic motions indicates that the spectra of all galaxies should show redshift as a consequence of the general expansion of the universe, the andromeda galaxy m31 appears to show a blueshift in its spectrum. why is this?

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  1. 21 January, 21:27
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    This is because Andromeda is headed toward the Milky Way. Eventually it will collide with our galaxy. When something is moving toward you it's light appears blue or, or blueshifted.
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