firstly I must agree with everyone - Alferian thanks for introducing such thought provoking and searching threads.
Laurelin I absolutely agree - nature is both kind and unkind. The Hindu's, possibly all the Indo-europeans, have G-O-D as Growth, Order, Decay or Destruction which in the Northern tribes could be the Vanir (Ingvi-Frey), Aesir (Odin) and Jotuns (Loki) or Vishnu, Brahma, Shiva (I think I'm not so clued up on the Hindu's).
Alferian within the example of the asteroid I think the only advice that can be given is that "it is the will of the God/the Gods/Allah etc..."
In the UK, as children, the story of our national hero Admiral Horatio Nelson always finishes with the story of him dying, at the battle of Trafalgar (his greatest triumph) from a gunshot wound. He turns to his next in command and friend and says
"Kismet Hardy" (kismet means 'it is my fate'). The apocryphal saying is "Kiss me Hardy".
As Brennus the leader of the Celts who invaded Greece told them (the Greeks):
"We Celts are afraid of nothing, except the sky falling in on our heads."
They focused on living an honourable life and having a brave death.
If we can manage that then the Summerlands/Heaven/Valhalla awaits.
The Norns sit at the root of the Yggdrasil the World Tree and not even Odin knows when they will snip the thread of life.
My wife's best friend died, at the age of 38, very suddenly of a brain tumour. She was a unique and special individual who was full of life. So it is a question we've mulled over this past year.