A typical analogy explaining redshift involves a siren or a train whistle. So how do we know the same phenomenon works with light?
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Well we know it happens because we can observe it. And use the effect quite a lot. Doppler radar is gonna be the big example. It’s used for weather stuff and radar speed guns.
The effect was first propose when Johann Doppler noticed shifts in light emitted by stars that corresponded to their motion. This was also a couple decades after the wave nature of light was discovered by observing interference patterns.
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