That’s fair. It’s also a little misleading because there are other cosmic events that could happen that are both closer to us and potentially further away, and have in the past. I wouldn’t say we are immune from the hazards of space but my comment could have been construed that way.

None. Space is big, and stars that can potentially supernova are rare. https://en.m.wikipedia.org/wiki/List_of_supernova_candidates

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Your local health department can probably test the tick for disease if you still have it. (At least mine does in my state). If not, there is pretty good success with early treatment: https://www.cdc.gov/ticks/pdfs/FS_TickBite.pdf