PPRuNe Forums


Jet Blast Topics that don't fit the other forums. Rules of Engagement apply.

Reply
 
Thread Tools Search this Thread
Old 6th Mar 2012, 16:08   #1 (permalink)
Thread Starter
 
Join Date: Aug 2000
Location: Patterson, NY
Age: 60
Posts: 0
The Universe vs. The Observable Universe

As Science relates to us, the Observable Universe is approx. 13.75 billion years "old". The diameter of the Observable Universe is approx. 93 billion light years with the "edge" of the Observable Universe at approx. 46-47 billion light years away.

However, some parts of the Universe may be too far away for their light to have reached us here on Earth. Thus, although these areas exist, we cannot observe them. And we may never be able to observe them because the Universe is expanding and their light may never reach us as these regions expand outward.

Even currently existing regions of the Observable Universe may eventually expand outward and become invisible. (Now you see it, now you don't.)

Thus, we have some scientists who posit that the whole of the Universe is at least 10 (23rd power) larger than the Observable Universe.
rgbrock1 is offline   Reply With Quote
Old 6th Mar 2012, 16:14   #2 (permalink)
 
Join Date: Jul 2006
Location: East of LGB
Age: 62
Posts: 618
Quote:
And we may never be able to observe them because the Universe is expanding and their light may never reach us as these regions expand outward.
Great

I needed something else to worry about today.
11Fan is online now   Reply With Quote
Old 6th Mar 2012, 18:34   #3 (permalink)
 
Join Date: May 2008
Location: Somewhere between E17487 and F75775
Age: 74
Posts: 723
I mentioned this to someone I know, he's reasonably normal*, in employment, drives a Ford, married, three kids (our godchildren as it happens) - he became very thoughtful and expressed worries we hadn't even started to get to know people in our galactic neighbourhood and there we are, they are drifting away from us at so fast a rate that we will never.........(etc etc)

And he was serious, too !

*Not too sure about this any more.

Back to my cupcakes. Nine left.
OFSO is offline   Reply With Quote
Old 6th Mar 2012, 18:47   #4 (permalink)
Está servira para distraerle.
 
Join Date: Jan 2002
Location: In a perambulator.
Posts: 2,855
Stephen Hawking thinks we should be extremely cautious of any contact with aliens. He compares an alien visit to the arrival of Christopher Columbus in America which was not very auspicious for the American Indian.
It's a matter of great relief and a cause for jubilation that the universe is expanding so fast as to place more space between us and any aliens than the thieving, murdering pillaging plunderers can compensate for in their massive ships. Battlestars which are even at this moment attempting to warp against the expansive flow of the universe, intent upon mowing us down and consuming us as though we were each and every one a fat and juicy asparagus.
It has already started. Best Cupcake Bakeries - National Geographic Traveler
cavortingcheetah is offline   Reply With Quote
Old 6th Mar 2012, 19:44   #5 (permalink)
 
Join Date: May 2008
Location: Somewhere between E17487 and F75775
Age: 74
Posts: 723
the thieving, murdering pillaging plunderers

You mean there's Welsh rugby fans out there ? oh my.............
OFSO is offline   Reply With Quote
Old 6th Mar 2012, 22:49   #6 (permalink)
Psychophysiological entity
 
Join Date: Jun 2001
Location: Tweet Rob_Benham Famous author. Well, slightly famous.
Age: 78
Posts: 4,397
In a serious moment, one wrote a post about this puzzling issue. 'twas in a solitary moment of brilliance, obviously, as I can't remember the facts or where I wrote it. However . . .

Many of the photons arriving now, have traveled 41 billion lightyears - and they can make it here. For them to have come from that far past the 13.7 billion mark, there must be a factor that's not immediately clear to the average chap or chapess - those that like to go down the chippy on a Friday night and put excessive quantities of vinegar on otherwise splendid traditional food, then swill it down with brown ale - Not clear at all to that sort of chap or chapess.

Given the inflationary period was rather short-lived, it's surprising just how far the universe got in such a miniscule spec of time. When the creators noticed the Universe was expanding vigorously, they ( no doubt ) said, Oh, good, it's working. Gravity and matter in juxtaposition is giving us a totally free lunch. Well done, us. But when they noticed it was exploding with a ferocious and uncontrolled energy, they quickly realized they'd have to do something about it. They're not known for hanging about.

At ten to the minus thirty-two seconds, they threw in a moderator, and in the blink of a very quick eye, things were back to normal - except for two things: One, the Universe was now inconveniently large, and Two, they'd used up all their antimatter to quell the springiness of their new Spacetime. This was especially inconvenient for those that had intended to build their physical homes with a negative sign. But, for the most part, they were pragmatic about it, and those that weren't, just had to lump it, though even they had a change of heart when the first star lit up.

Wondrous! Marvelous! Jolly good! Cried the beings clustered around the first star.


No it bloody isn't! Came a voice from the dark.


Right. Cork from bottle number two. Remove.
Loose rivets is online now   Reply With Quote
Old 6th Mar 2012, 22:52   #7 (permalink)
 
Join Date: Nov 2003
Location: Great White North
Posts: 138
"Space," it says, "is big. Really big. You just won't believe how vastly, hugely, mindbogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space, listen..."
Mostly Harmless is offline   Reply With Quote
Old 6th Mar 2012, 23:19   #8 (permalink)
 
Join Date: Jul 2006
Location: East of LGB
Age: 62
Posts: 618
Side note. I went to the Air and Space Museum in Washington. I was surprised. They actually had all kinds of stuff in there.

Certainly not what I expected.
11Fan is online now   Reply With Quote
Old 7th Mar 2012, 00:08   #9 (permalink)
 
Join Date: Nov 2009
Location: UK
Posts: 350
Quote:
I mentioned this to someone I know, he's reasonably normal*, in employment, drives a Ford, married, three kids
Sorry, but this is so contradictory. You say he is reasonably normal, yet in the same sentence states he drives a Ford. Madness I tell you, sheer and utter madness.
jackieofalltrades is offline   Reply With Quote
Old 7th Mar 2012, 00:47   #10 (permalink)
 
Join Date: Jul 2006
Location: East of LGB
Age: 62
Posts: 618
Thread Drift

Quote:
Madness I tell you, sheer and utter madness.
Then I'm nuckin futs because I have 3 in the driveway.

Then again, I've always had good luck with Fords. More of a US thing as well, I'll continue to buy Fords because they didn't take the bailouts.

My Ford history:

2006 Freestyle Limited (present)
2003 Focus SE (present) - Two of them for the girls.
1987 F150 4X2 (past)
1980 Mustang Fastback (past)
1974 Pinto Pony (past)
1969 Thunderbird Landau (past)

First car was a Chevy and I blew up the engine in that.
11Fan is online now   Reply With Quote
Old 7th Mar 2012, 04:02   #11 (permalink)
 
Join Date: Feb 2008
Location: The Ethereal Land of Vintage Aviation
Posts: 125
Do They Have Imodium in Space?

Quote:
"Space," it says, "is big. Really big. You just won't believe how vastly, hugely, mindbogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space, listen..."
Mostly Harmless, depends on what one needs at the chemists!
V2-OMG! is offline   Reply With Quote
Old 7th Mar 2012, 08:02   #12 (permalink)
Cunning Artificer
 
Join Date: Jun 2001
Location: The spiritual home of DeHavilland
Age: 70
Posts: 3,064
Quote:
the universe got in such a miniscule spec of time.
There you go again. What time is it? ...and where?

Every equation that you see concerning matter, mass, energy etc. includes a term that is time, with time considered a constant. But it isn't.

Consider: time and distance are simply different ways of expressing the same thing and one of the two is definitely a variable, ergo, so is the other. The universe is as large or as small as you want it to be.
Blacksheep is offline   Reply With Quote
Old 7th Mar 2012, 08:11   #13 (permalink)
 
Join Date: May 2001
Location: Newcastle/UK
Posts: 1,473
Crystal Spheres,that's all it is,the ancients figured it all out years ago.
tony draper is offline   Reply With Quote
Old 7th Mar 2012, 08:34   #14 (permalink)
Ecce Homo! Loquitur...
 
Join Date: Jul 2000
Location: Brighton
Age: 64
Posts: 8,809
Quote:
However, some parts of the Universe may be too far away for their light to have reached us here on Earth. Thus, although these areas exist, we cannot observe them. And we may never be able to observe them because the Universe is expanding and their light may never reach us as these regions expand outward.
it's called the Light Cone.
ORAC is offline   Reply With Quote
Old 7th Mar 2012, 08:49   #15 (permalink)
 
Join Date: Aug 2005
Location: Edinburgh and 3C
Age: 65
Posts: 195
It may help to think of it as equivalent to women vs attainable women. The ratio is about the same.
MagnusP is offline   Reply With Quote
Old 7th Mar 2012, 10:50   #16 (permalink)
 
Join Date: Oct 1999
Location: Ireland
Posts: 630
Thanks Magnus, now I understand perfectly. My known universe is very small indeed.
corsair is offline   Reply With Quote
Old 7th Mar 2012, 23:31   #17 (permalink)
Psychophysiological entity
 
Join Date: Jun 2001
Location: Tweet Rob_Benham Famous author. Well, slightly famous.
Age: 78
Posts: 4,397
The OP opens a very interesting subject, and given that Scientific American . . . or was it New Scientist? Sci Am I'm sure, made this very problem their main subject in one publication. They said, even some astronomers and physicists were getting confused about it, so, they said, here goes.


It was good. And for a while it all made sense, but like most things in my brain, they seem to fade. But, interesting it is.

I'm not sure how they know how old the photons coming by are. Quite a challenge that, but the figure of 41 billion years was give or take a billion. If I remember correctly, it was because of the Big Bang - thanks Fred - that the Universe could get so big so quickly. Remember, the fabric of the Universe is not bound by the speed of light.

If Peter Higgs is right, the Higgs field might well possess its own unpacking power, and I think the missing quantities and energy may well be a quite simplistic part of its characteristics.



Can we talk about gravity now please.
Loose rivets is online now   Reply With Quote
Old 7th Mar 2012, 23:57   #18 (permalink)
 
Join Date: Nov 2003
Location: Great White North
Posts: 138
Quote:
Then I'm nuckin futs because I have 3 (Fords) in the driveway.
Is that because none of them are in working order?

I have owned Ford cars before and I can assure you that I wouldn't accept one if it were free.

Quote:
It may help to think of it as equivalent to women vs attainable women. The ratio is about the same.
The ratio has to be better than that.
Mostly Harmless is offline   Reply With Quote
Old 8th Mar 2012, 00:27   #19 (permalink)
 
Join Date: Jul 2006
Location: East of LGB
Age: 62
Posts: 618
Quote:
Is that because none of them are in working order?
Thousands of comedians out of work and you're making jokes.
11Fan is online now   Reply With Quote
Old 8th Mar 2012, 00:42   #20 (permalink)

Hovering AND talking
 
Join Date: Feb 2003
Location: Propping up bars in the Lands of D H Lawrence and Bishop Bonner
Age: 53
Posts: 5,717
Quote:
Is that because none of them are in working order?
Could be worse 11Fan ... there could be signs of slippage in the usage of the English language.

Cheers

Whirls
Whirlygig is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT. The time now is 22:08.


© 1996-2012 The Professional Pilots Rumour Network

SEO by vBSEO 3.6.1