[ExI] Every Year we lose more of the Universe
pharos at gmail.com
Sun Dec 30 20:24:52 UTC 2018
The Inevitable Abyss: Each Year, We Lose Another Section of The Universe
JOLENE CREIGHTON 29 DEC 2018
At the outer reaches of the known Universe, entire galaxies - and all
of the stars, planets, and alien species they may contain - are
Of course, these objects aren't simply evaporating. They are being
thrust out of the known Universe, forced into a mysterious expanse
known as the "unobservable Universe."
Now, if the expansion of the Universe wasn't accelerating, given
enough time, we'd eventually be able to see everything in the cosmos.
But this isn't the case.
Because of accelerated expansion, regions of space that are
sufficiently distant from Earth are moving away from us faster than
the speed of light. This doesn't sound too alarming, until you stop
and realise that light from these regions of the cosmos will never be
able to reach us.
At the present juncture, if a photon left our planet and started to
travel out into the cosmos, it would never be able to reach any area
of space that's more than 15 billion light-years away, as space beyond
this point is expanding faster than the speed of light.
Ultimately, this means that, even if we left today and were travelling
at lightspeed, we'd only ever be able to reach a mere 3 percent of the
total number of galaxies in our observable Universe.
The other 97 percent are forever beyond our reach.
Of course the implication is that 97% of the universe that we can see
can never contact us.
We'll have to make do with nearby galaxies.
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