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Old 11-03-2010, 03:53 PM   #1135
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To Jim and Susan

Just depends upon which direction you are looking at it....
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Old 11-04-2010, 05:03 PM   #1136
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OKay, so I get the whole Space-Time Continuum thing, in a Gene Roddenberry, Star Trek sorta way. But, can somebody explain to me how the Universe is 60 billion light years wide if it's only 14 billion years old? Is this like the national debt calculator--we're just supposed to accept it and move on?

Jim
I think an appropriate comparison would be my weight. I'm wider than I am old . AND, I'm shrinking to boot. I hate when this happens
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Old 11-04-2010, 10:37 PM   #1137
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Now you got me thinking about it, so here goes....

In astronomy, we measure distance by making it equivalent to the distance traveled by a photon that left the object and reached us. By the time the photon reaches us, the real position of the object has move outwards at the rate of inflation.

Therefore, the object that we see today at (apparently) 13.7 billion light years, would "now" be at roughly 46 billion light-years. This is called the "comoving distance", meaning the distance where the object should be now if we correct for the expansion of space between us and the object, for the 13.7 billion-year period.

Also, observations by the probe WMAP tells us that the total universe is AT LEAST three times bigger than the portion we can see. Therefore the minimum size of the whole universe is 3 times 13.7 times 2 (to go from radius to diameter) = roughly 90 billion light-years (which would be on the same scale as the 13.7, except that one cannot "look back" to a time before the start of the universe).

The "comoving diameter" therefore has a MINIMUM value of somewhere around 300 billion light-years. The MAXIMUM size of the universe is still set at infinite (there is no evidence showing that an infinite universe is impossible).

The fact that the distance between us an an object increases faster than 300,000 km/s does not contradict any principles, since the "speed" does not represent movement. It is the amount of space between the objects that increases everywhere by a (relatively) slow rate. The objects themselves are not moving rapidly through space.

However, since the information from one to the other can only travel at the speed of light, if an object is further away than 13.7 billion light-years (in look-back distance), then we will never see that object.

Does that make it any more clear?

Carol
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Old 11-04-2010, 10:52 PM   #1138
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..... Does that make it any more clear?

Carol
It kind of depends on the boot. (see post 1138)

>>>>>>Action
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Old 11-06-2010, 01:44 AM   #1139
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Space, says the introduction to the guide, is big. Really big. You just won't believe how vastly, hugely, mind bogglingly big it is.

42 is the correct answer to the ultimate question about the universe.

"I know this great restaurant at the end of the universe. " Ford Prefect

Hitchhiker's Guide to the Galaxy
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Old 11-06-2010, 12:33 PM   #1140
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There are other laws at work in the universe, operating on a deeper level than the one we know.....

I just hope I stay
smarter that my height combined
with my circumference

Carol
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Old 11-06-2010, 02:50 PM   #1141
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There are other laws at work in the universe, operating on a deeper level than the one we know.....

I just hope I stay
smarter that my height combined
with my circumference

Carol
You are right Carol,

There's also the law my wife lays down from time to time when I find another Airstream or hotrod I want to buy. I take that law very seriously. Far more seriously than any other laws that happen to be in place at the time.
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Old 11-08-2010, 07:16 PM   #1142
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I don't generally do stuff like this on this forum, but this is cool. Hope I did it right.

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Old 11-08-2010, 07:51 PM   #1143
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I don't generally do stuff like this on this forum, but this is cool. Hope I did it right.

YouTube - Opera Company of Philadelphia "Hallelujah!" Random Act of Culture!

That was just outstanding Jim. Thank you for posting it. I then found some others down the sidebar and they were pretty good too, but this one just fits the coming season to a T
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Old 11-09-2010, 07:06 PM   #1144
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Something I've wondered about

If Vulkem is designed to last 30 or 40 years, how come there's an expiration date on the end of the tube?

Jim
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Old 11-09-2010, 07:52 PM   #1145
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Now you got me thinking about it, so here goes....

.......Does that make it any more clear?

Carol
Well, er, um. My Sky and Telescope subscription expired, so I'm having a little trouble following.

So let me noodle this out. Most people here use a "handle" or pseudonym. Yours is Cclarkego. Your first name is Carol. Could be short for Carolyn. I got it, you're Carolyn Porko ! Nah, she's more of a planetary kinda gal. You seem more of a theoretician. She's into planetary observation. You're into far away stuff. Is it true they actually use a 2" eyepiece at Keck?

Jim
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Old 11-09-2010, 07:57 PM   #1146
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Jim here's something else to ponder. Rat poison also has an expiry date. What happens to it after that date? Does it become edible? If vulkem sticks like glue why doesn't it stick to the tube? Kind of makes you go hmm.
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Old 11-09-2010, 09:07 PM   #1147
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Have been enjoying Christmas Carols tonight - choir stuff. Very nice. Setting the mood in advance for Christmas while I try to figure out what I am getting my Airstream this year for Christmas, and more importantly, what it is getting me . I have some suspicions, and of them would be a telescope. You know, one of those things you look through to see the stars without first knocking your head on the hoist or some other too low object.

I'm thinking my trailer might get, oops, almost let it slip, and it just seems to know what I post on this forum.
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Old 11-09-2010, 09:12 PM   #1148
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The pause...that impressive silence, that eloquent silence, that geometrically progressive silence which often achieves a desired effect, where no combination of words, howsoever felicitous, could accomplish it.

Hmm, I think certain aptitudes are hereditary.
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