Yes, ‘url parameters’ start with a question mark and then any after the first are separated with ampersands. Often some of them may be for tracking, but not always.
It’s only tangentally related to black holes, but this reminded me of a demo/small game I once played. For people interested in messing with relativistic speeds and the weird stuff that happens with light, I suggest giving gamelab.mit.edu/games/a-slower-speed-of-light/ a go. It’s a game developed by MIT that simulates a downscaled speed of light, so you can play around with relativistic effects, like red/blue shifting and perspective warping.
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