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In page Redshift:
"Doppler blueshift is used in astronomy to determine relative motion:
- When observing spiral galaxies, the side spinning toward us will have a slight blueshift relative to the side spinning away from us (see Tully–Fisher relation).
- Blazars are known to propel relativistic jets toward us, emitting synchrotron radiation and bremsstrahlung that appears blueshifted.[citation needed]
- Nearby stars such as Barnard's Star are moving toward us, resulting in a very small blueshift.
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