(1) An Long Island sized NEO asteroid?

(2) Our sun eventually becoming a redgiant?

(3) A nearby GRB?

(4) A nearby supernova?

(5) A cosmic-scale superstring smashing into our planet?

Yes! Anyone of these could wipeout all life on Earth; or at least
cause large scale mass-extinction of most biological species on this
orb of 'ours'.
But is there yet one more cosmic threat? One that could conceivably
wipe out, vaporize, flame out 'everything' visible and physical in this universe?

We all know of the theory that subatomic quantum 'foam' may
pervade the universe; amd that one cubic centimeter [the volume of a thimble]
of that subatomic quantum foam contains enough latent energy to boil the all the water in our oceans.
There is some empirical evidence to support the existence of this 'foam'
and the awesome energy it may contain; but for the most part, this editorial blog
is based on pure speculation and conjecture.
I then have to support my conjecture with the slogan [accept it or not]
that I disagree with the hitherto unspoken notion that 'if science doesn't know about it,
it doesn't exist'. I say, "science isn't static, so it cannot use a mere verbal or written argument against something it hitherto cannot detect nor understand."

If indeed such awesome latent energy exists inside that universe wide cosmic foam,
what would happen if that foam suddenly starts to disintegrate across the universe?
The intense, fiery energy release would be horrifyingly destructive.
Every planet, moon, asteroid and stellar body across the universe would either disintegrate, vaporize or vanish in an awesomely intense display of light, heat, subatomic, nuclear and thermodynamic destruction.

If such an event could occur, could it occur today? 1,000 years from now, a billion years from now? Perhaps a trillion years in the future?...Maybe it could occur slowly? Maybe it
will never happen?..But I seriously doubt science has the authority or the understanding
to say it's impossible.
In nature, we see things like old clothing, aging lifeforms, old cars, aging mountains, stars,
molecules, large atomic nuclei, etc. undergoing gradual decay and in some cases rapid or sudden disintegration. Even mere protons are suspected of undergoing decay, though evidence is lacking.

I pose this speculation not to alarm people but to challenge the validity of the space colonization/migration goal based on the concept that humans need to preserved from
extinction events...I go outside the box, and argue why?...Why do we need preserving?
It maybe futile for one, it may be self-glorifying for another?
I think that the universe may ultimately reveal unpleasant and unwelcome surprises to humanity that homo sapiens will have no power to counter or defeat.
I say, Carpe Diem.