#doppler effect

[todays-xkcd]

The Doppler effect is a mysterious wavelength-shifting phenomenon which seems to primarily affect sirens, which is why the 🚨 emoji is red.

Doppler Effect [Explained]

Transcript

[Miss Lenhart is pointing with a stick to a whiteboard with various scientific drawings and words, including but not only a graph.] Miss Lenhart: The more distant a galaxy is, the redder its light. Miss Lenhart: Why? Well, that's an interesting question.

[Zoom in on Miss Lenhart.] Miss Lenhart: Ever notice how, when a siren is approaching, it sounds like Bweeeeeeeeee...

[Zoom in on Miss Lenhart with her arms raised.] Miss Lenhart: ...but then it zooms past you and goes Nyeeeeooooowww? Miss Lenhart: And sometimes they hit a button that makes it go Pyeew! Pyeew! really loud?

[Miss Lenhart with her finger raised is standing in front of the whiteboard and holding the stick down.] Miss Lenhart: And in Europe they go Ooooeeeeooooeeee... Off-panel voice: So why are galaxies red? Miss Lenhart: Oh, no idea. Miss Lenhart: Anyway, another siren I like is...

[fragrantblossoms]

Seiko Kanno. Doppler Effect, 1975–76. acrylic on canvas. Collection of the National Museum of Modern Art, Kyoto

[thinkingimages]

[non-cannon]

[jaubaius]

This is what it sounds like when you drop a piece of ice down a hole drilled in Antarctica🔊

Source

[macmanx]

Star Trek TNG Theme, but the theme is coming from the Enterprise-D.

[melodeelaine]

Lines Have Been Drawn

[schroedingerscryptid]

so like even though redshifts and blueshifts are two different things, since they operate on the same principle, can we call them Doppler-gängers