If you grew up in the 80s, you also spent a lot of time wondering if you'd survive a nuclear attack, and then you found out that it doesn't really matter, because the fallout would kill you anyway. This is why Gen X's brand is indifference.
Anyway, according to Science Alert, survivability of a nuclear attack depends on a lot of things, like how far you are from the hit, what the weather is like, if there are any mountains between you and the explosion, and, obviously, how big the bomb is. But for the most part, the farther away you are, the better. At roughly 7 miles from a 1 megaton nuclear bomb strike, you can expect to get a nasty sunburn, but you won't die. At least not right away.
If you were just seven miles from the Chicxulub impactor, well, let's just say that was far enough away that you'd get to experience instantaneous death, thus saving yourself from the years of suffering that would follow. What if you were 500 miles away? Instant death. Because the impact created a wall of rock and debris roughly 20 miles high and generated a fireball traveling at about 1,000 miles per hour (via Wired). In fact, according to National Geographic, everything within about 625 miles of the impact died instantly. To put that into perspective, that's roughly the straight line distance between Phoenix and San Francisco (via Distance.to).
