Munthon - Misconceptions about the Big Bang

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Misconceptions about the Big Bang

Misconceptions about the Big Bang	Mar. 18th, 2005 @ 12:08 pm

Ieksh Scientific American atradu interesantu/zinaatnisku/filozofisku rakstu par lielo spraadzienu.

Kaads citaats:
What Is Expansion, Anyway?
When some familiar object expands, such as a sprained ankle or the Roman Empire or a bomb, it gets bigger by expanding into the space around it. Ankles, empires and bombs have centers and edges. Outside the edges, there is room to expand into. The universe does not seem to have an edge or a center or an outside, so how can it expand?

A good analogy is to imagine that you are an ant living on the surface of an inflating balloon. Your world is two-dimensional; the only directions you know are left, right, forward and backward. You have no idea what "up" and "down" mean. One day you realize that your walk to milk your aphids is taking longer than it used to: five minutes one day, six minutes the next day, seven minutes the next. The time it takes to walk to other familiar places is also increasing. You are sure that you are not walking more slowly and that the aphids are milling around randomly in groups, not systematically crawling away from you.

This is the important point: the distances to the aphids are increasing even though the aphids are not walking away. They are just standing there, at rest with respect to the rubber of the balloon, yet the distances to them and between them are increasing. Noticing these facts, you conclude that the ground beneath your feet is expanding. That is very strange because you have walked around your world and found no edge or "outside" for it to expand into.

The expansion of our universe is much like the inflation of a balloon. The distances to remote galaxies are increasing. Astronomers casually say that distant galaxies are "receding" or "moving away" from us, but the galaxies are not traveling through space away from us. They are not fragments of a big bang bomb. Instead the space between the galaxies and us is expanding. Individual galaxies move around at random within clusters, but the clusters of galaxies are essentially at rest. The term "at rest" can be defined rigorously. The microwave background radiation fills the universe and defines a universal reference frame, analogous to the rubber of the balloon, with respect to which motion can be measured.

Eh, kaa man patiik shiis lietinjas :)

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From:	ghost
Date:	March 26th, 2005 - 01:45 pm

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Es taa vakar domaaju par sho teemu un nonaacu pie shaadām domaam:
1) Visums izpletiisies muuzjiigi (maz ticams);
2) Visums pletiisies un peec tam sarausies kaa gumija;
3) Visums izpletiisies un sadaliisies 2 daljaas.

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From:	munthon
Date:	March 28th, 2005 - 03:35 am

Mjaa

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Visuma paarpliishanas iespeejamiiba buuutu jaapapeeta vairaak...

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