Doomsday Scenarios: What Astronomical Process Poses Greatest Risk?

[Breathe the o2]

Hi all,

I'm new to the forum,so please excuse my ignorance

I was reading through some of the threads in here and my mind is completely boggled!

Just wondering,in all your opinions,what astronomical process do you reckon will pose the greatest threat to man-kind in relation to extinction??I know it's a very broad topic but would love to see your opinions!

Cheers

 

[Holocene]

Just wondering,in all your opinions,what astronomical process do you reckon will pose the greatest threat to man-kind in relation to extinction??

At this rate, we won't have to worry about natural processes, because we will have destroyed ourselves long before.

 

[mgb_phys]

Most likely - large meteor/comet impact. Happens every few 100million years. Big blast, clouds of dust, long winter. Wipes out 50-90% of species. Not good.

Less likely - nearby supernova. Radiation kills pretty much everything living on surface. Ok if you are a fish.

Least likely - nearby gamma ray burst (supernova on steroids). Radiation shreds planet like a butterfly hit by a shotgun. Game over.