I wouldn't want to play with time travel, but I would like to see a close-by supernova happen in real time. Betelgeuse is suppose to go boom in about 50,000 years, and it'll be about as bright as Moon for in the least a couple of days.
And I'm not sure, it's late so I don't feel like doing a lot of math, but I know Andromeda is like 2.5e^5 ly across, and I'm guessing a buss is something like 1e^-16 to 1e^-18 ly, so dividing the two it'd be in the ball park of 1e^21 to 1e^23 busses. Let me know if I'm anywhere near correct.
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Lol I found the answer in feet I think I gotta find the sheet where I did the math I'll get back to u on the answer tho