it’s not something you’d expect to happen particularly often
Once every 12 years or so..? :-)
Once every 12 years or so somewhere in the world. Near enough a nuclear reactor to cause trouble, not so often.
Once per decade per planet (i.e. 2e-10/km²/yr) is “particularly often”?
I merely quantified your “not particularly often” :-)
Once every 12 years or so..? :-)
Once every 12 years or so somewhere in the world. Near enough a nuclear reactor to cause trouble, not so often.
Once per decade per planet (i.e. 2e-10/km²/yr) is “particularly often”?
I merely quantified your “not particularly often” :-)