On Wed, 6 Sep 2017 16:58:24 -0700, "billbowden"
<
bpe...@bowdenshobbycircuits.info> wrote:
>
>"rumpelstiltskin" <
x...@y.com> wrote in message
>news:afmvqcpffavjgv1vh...@4ax.com...
>> On Wed, 06 Sep 2017 01:21:16 -0700, El Castor
>> <snip>
>>
>>
>>>Infinity in time and space means that our universe hasn't been around
>>>as long as the blink of a fly's eye and is smaller than one grain of
>>>sand in all the beaches of the world. I don't consider myself to be
>>>religious, but in an infinite universe, it is not unreasonable to
>>>believe anything is possible. In case you haven't seen it, Netflix has
>>>season one of a TV series with a different take on the afterlife, The
>>>Good Place. Trust me, do yourself a favor and watch it.
>>
>>
>> I think I'll take a pass on that. The name definitely sounds
>> like the usual feelgood stinkpot stuff that gave us kkkristianity
>> and Islam and other such blessings. I've hardly ever had
>> indigestion, but that kind of stuff might do it.
>>
>> Infinity is just a mathematical device. Our universe, which
>> is all we know of time and space, is not infinite and "never"
>> will be.
>>
>>
>
>
http://www.esa.int/Our_Activities/Space_Science/Is_the_Universe_finite_or_infinite_An_interview_with_Joseph_Silk
>
>ESA: What would be the size of the Universe if it was finite?
>
>Joseph Silk:
>It could be as large as 100 t imes the horizon. That means that the Universe
>would be as much as a 100 thousand million parsecs, about 300 thousand
>million light years, if we could measure the topology.
I don't know the exact figure but it is known at least out
to where the first galaxies appear so we can see something.
Weinberg covered that in his wonderful book written for
ordinary folks like thee and me, "The First Three Minutes":
http://tinyurl.com/yakoj8uw
The Universe is still expanding, since the enormousness
of the explosion 13 billion years ago is still pushing it out.
Very strangely, recent measurements suggest that
although one would think that the expansion would be
slowing down (because the explosion is long over so
gravity should be acting to pull things back together),
the expansion of the universe seems to be speeding up.
It's hard to imagine how this could be. A fifth "force of
nature" has been proposed to account for it, though it
seems premature to me to propose something so
radically new and otherwise unneeded, until we have
a firmer understanding of what we're seeing.
The strong and the weak forces act on atomic
levels, so we don't see them directly at all, but the
strong force holds atoms together. The weak force
is much weaker and is involved with the decay of
neutrons (and perhaps ultimately, protons) but
unlike the other forces it's asymmetrical and has a
small preference for matter over antimatter. For
that reason, the weak force may be (ISTM) the
reason we have a universe at all, since the
recombination of matter and antimatter that was
arguably the biggest reason for the power of Big
Bang had some leftover matter that didn't have
any antimatter to recombine with, and that small
remainder makes up everything in our universe
except for the brief and relatively infrequent
radioactive actions that briefly create some new
antimatter which quickly gets gobbled up by
explosive recombination with some of the
matter that's all around it.
The two forces we do see everyday are
electromagnetism, which makes the sun shine
and which works over relatively short distances,
and gravity which seemingly has "infinite" reach.
Perhaps that reach isn't quite "infinite" and that's
why the expansion of the universe seems to be
speeding up over vast distances. Or at least
that seems to me a possibility in my ignorance,
such that the weakening of gravity over truly
vast distances might allow it to be overwhelmed
by the power of the other phenomena that are
expansive, such as radioactive decay.
As to what a force "is", I don't think
we've gotten past "A force is a name for
something we don't understand."