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Author Topic:   new visitor with a logic question
crashfrog
Member (Idle past 1495 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 6 of 57 (60432)
10-10-2003 1:41 PM
Reply to: Message 1 by baileyr250
10-10-2003 3:28 AM


To me it seems as though he is attempting to grasp the concept of infinity, which is in fact uncomprehendable.
There's nothing "uncomprehendable" (incomprehensible is the word you're looking for, btw) about infinity. It's simply the name for the phenomoneon that there's no largest or smallest number.
Anyway if cosmology is to be believed there's no infinite past. The universe has non-infinite age. We know thi must be so, in fact, because (as John pointed out once) if the universe was infinitely large or old, it would be so large that there would be a star at some distance at every point in the night sky, and the night sky would be blindingly bright as an infinite number stars shone infinite light onto the earth.

This message is a reply to:
 Message 1 by baileyr250, posted 10-10-2003 3:28 AM baileyr250 has not replied

crashfrog
Member (Idle past 1495 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 8 of 57 (60440)
10-10-2003 2:22 PM
Reply to: Message 7 by baileyr250
10-10-2003 1:52 PM


If the universe were infinite, does that necessarily mean that it must be filled with mass in the form of stars, and by the same token if the universe is infinite, we would never see most of the stars or matter, or whatever is out there because it would take an infinite amount of time for the light to reach us.
Yes, but if the universe is infinitely old, then that's not a problem - we'd see an infinite amount of light coming from an infinite number of stars, for an infinite amount of time, in every direction.
Basically imagine sight-lines extending from your eyes out into the universe. There's no direction you can direct your gaze where your sight-line doesn't intersect with a star - with an infinite number of stars behind it.
The idea of an infinite, eternal universe is fun but it's contrary to observation. So one of several possibilities must be true:
1) The universe is infinite but not eternal; it has a terminus at both ends of time.
2) The universe is infinite and eternal in the future only - the universe will always exist though it has not always existed.
3) The universe is finite in both time and space, but unbounded in the three spacial dimensions we percieve (so that it's not possible to travel to the "edge" of the universe).
I favor the last one, myself. I don't think infinity is actually a thing that can exist in any physical sense.
[This message has been edited by crashfrog, 10-10-2003]

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 Message 7 by baileyr250, posted 10-10-2003 1:52 PM baileyr250 has not replied

crashfrog
Member (Idle past 1495 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 46 of 57 (64054)
11-02-2003 10:07 PM
Reply to: Message 45 by Wize
11-02-2003 9:57 PM


Registering under multiple names is not likely to keep you around here long, Wize. Seriously. If you want back in, you just have to email one of the admins and pledge better behavior in the future. But this stunt will lead to getting your IP banned, I've seen it happen.

This message is a reply to:
 Message 45 by Wize, posted 11-02-2003 9:57 PM Wize has replied

Replies to this message:
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