this post was submitted on 23 Dec 2025
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Exercise for the reader: Assuming average human eyesight, how many picoseconds away from a collision are you if you can read that size of text and the relative velocity between you and the car ahead of you is large enough that the red label is sufficiently blueshifted to look blue?
for 800nm to 400nm, we need gamma=2. So v~.86c. At 20m this gives you ~80ns.
For perspective, this speed is:
In one second, you would travel around:
Which is around 6.43 times around the Earth's equator.
But how many Olympic sized swimming pools full of jello?
About 3 large boulders the size of a small boulder.
Did you see the boulder post too?
We are all the size of boulders on this blessed day.
Depends on the flavor
So, some paint might get exchanged?
It was a graveyard graph.
He caught up in a flash!
The sticker should also say something like "But don't worry, we're going to be evaporated in a huge explosion anyway, due to the gigantic release of energy when you crash into my car in a few nanoseconds."
does the observer have to be able to see the sticker with normal human eyesight? if so that constrains distance (which maybe doesn't matter?)
At that point it’s like the end of 2001: A Space Odyssey
I want to know how fast you need to go to be color shifted on a traffic camera. The more I think about it the less likely getting enough light to be picked up by the camera might be an issue even with perfect placement
I think the problem would be getting enough reflected light and not too much radiant light from the compression and/or fusion plasma.