The idea thing would be to measure the speed of light for higher energy forms of light, like x-rays and gamma rays. But I’m not aware of any experiments that do that.
Err… build a broad spectrum telescope and look at an unstable stellar entity?
That’s an interesting idea. But the method one detects gamma rays or x-rays is very different than what one uses to detect light, so calibrating would be tough. And most unstable events take place over time, so this would be really tough. Look at for example a supernova- even the neutrino burst lasts on the order of tens of seconds. Telling whether the gamma rays arrived at just the right time or not would seem to be really tough. I’m not sure, would need to crunch the numbers. It certainly is an interesting idea.
Hmm, what about actively racing them? Same method as yours but closer in. Set off a fusion bomb (which we understand really well) far away (say around 30 or 40 AU out). That will be on the order of a few light hours which might be enough to see a difference if one knew then that everything had to start at the exact same time.
Telling whether the gamma rays arrived at just the right time or not would seem to be really tough. I’m not sure, would need to crunch the numbers.
Short answer: The numbers come out in the ballpark of hours not seconds.
Hmm, what about actively racing them? Same method as yours but closer in.
Being closer in relies on trusting your engineering competence to be able to calibrate your devices well. Do it based off interstellar events and you just need to go “Ok, this telescope went bleep at least a few minutes before that one” then start scribbling down math. I never trust my engineering over my physics.
Err… build a broad spectrum telescope and look at an unstable stellar entity?
That’s an interesting idea. But the method one detects gamma rays or x-rays is very different than what one uses to detect light, so calibrating would be tough. And most unstable events take place over time, so this would be really tough. Look at for example a supernova- even the neutrino burst lasts on the order of tens of seconds. Telling whether the gamma rays arrived at just the right time or not would seem to be really tough. I’m not sure, would need to crunch the numbers. It certainly is an interesting idea.
Hmm, what about actively racing them? Same method as yours but closer in. Set off a fusion bomb (which we understand really well) far away (say around 30 or 40 AU out). That will be on the order of a few light hours which might be enough to see a difference if one knew then that everything had to start at the exact same time.
Short answer: The numbers come out in the ballpark of hours not seconds.
Being closer in relies on trusting your engineering competence to be able to calibrate your devices well. Do it based off interstellar events and you just need to go “Ok, this telescope went bleep at least a few minutes before that one” then start scribbling down math. I never trust my engineering over my physics.