Can entropy be reversed?
You've likely seen this, but:
THERE IS AS YET INSUFFICIENT DATA FOR A MEANINGFUL ANSWER.
We simply don't know enough about the source of energy to know.
Were an absolute insulator (a material that lets absolutely no
energy through), and shaped into a ball, then entropy could
hypothetically be resisted. However, this would not REVERSE
entropy, as no new energy could be brought in without opening the
sphere and letting the contents escape.
What many people don't understand is that there is no actual
true entropy. When energy leaves something, it doesn't cease to
exist, but simply goes to a spot that we can't use it. The
disorganization of all energy, the placing of each particle apart
and out-of-reach, is what commonly thought of entropy actually
With the theory that the (our) universe is closed, and nothing
escapes, the scattered energy could be floating around,
occasionally meeting, and possibly bouncing off the borders of the
universe. EVENTUALLY, which could be in an unimaginable amount of
time (Literally unimaginable. You can conceive of the
inconceivability, but not the actual number.), the particles of
energy and whatnot could eventually meet again in sufficient
numbers to be worth something, hopefully another Big Bang.
With the theory of an open universe, there are two different
(relevant) possibilities. The first is that there are infinitely
more BB's (Big Bangs) all over our plane of existence, that our BB
was not the only one, and that the expanding matter of each can
pass that of other BB's. Should this be the case, there is an
infinite amount of energy in existence, and more of anything can
EVENTUALLY be encountered again.
If, however, we are the only Big Bang, and there is no other
source of anything, we're theoretically screwed. (Not to worry,
though: It's actually more likely that there are more Big Bangs
than that we're all alone.)
Of course, in any of these, there is the possibility that our
Universe's (from our Big Bang) gravity will be enough to catch the
far-flung galaxies and draw them back in for "The Big Crunch", when
everything gets squished into one point again, and hopefully Banged
I believe that the last person to answer this question probably
had some understanding of different universe theories, but didn't
quite get what entropy was.
In general entropy is the decay of a system from order to chaos.
It can be reversed, locally. However to do so requires work, and
energy, which is obtained by taking a different ordered system and
reducing it further towards chaos. So while I may reverse entropy
in my room (it is cleaner) I've increased the entropy in my body,
in excess of what I've cleaned up.