Hubble Space Telescope infrared image.
Does the horse head nebula that we all grew up seeing in the 60s still look like a horse head today some 40 50 years later ?
Interesting question. It’s 2-3 light years across, so something moving in it would still have to be traveling an appreciable percentage of the speed of light just for us to notice it in half a century.
With ZERO knowledge, I would think 20 years is nothing in the scheme and that the nebula while in motion would look exactly the same a million years from now...?
Hubble Space Telescope infrared image.