Imagine that you could observe these natural disasters in such a way that you would not die nor would anyone else- there would be no harm to you and others whatsoever. You would be able to experience and see every single thing you would love to know about it. Which do you think would be the neatest to simply observe first hand?
Being Sucked in by a Black Hole
Asteroid Hitting the Earth
Gamma Ray Burst
If I have left something out please feel free to add