If you want to irritate armchair physicists on Reddit, just tell them that length contraction isn't a visible effect. Are Bluesky physicists more open-minded? ⚛️🔭🧪
Explanation: You don't see an object's length (dist. between its endpoints at a fixed time). You see photons that arrive simultaneously.
The invisibility of length contraction – Physics World
Objects travelling at relativistic speeds will shorten as a consequence of Einstein's special relativity. But what, asks David Appell, if you try to look at such an object?
