Re: accelerating universe and Leslie constraints

Julian Leviston (
Wed, 31 Mar 1999 10:16:46 +1000

At 02:55 AM 29/03/99 -0500, Michael Lorrey wrote:
>Julian Leviston wrote:
>> If the universe is constantly expanding, how is it that we think that the
>> earth is cooling down adn that the moon was once an earth but is now dead?
>> Wouldn't it follow that if the universe is expanding, then things would be
>> getting hotter, then the earth would be becoming more towards like the sun
>> and the moon like the earth...?
>Not at all. In the simplistic logic you are using, expansion leads to cooling
>(check the simple gas laws in any high school physics or chemistry book),
>the cooling and slowing of local astronomical objects has little to do
with the
>expansion of the greater universe.

If I put some heat energy into a thing, then it expands. This is true, right? The heat energy is coming from some other source - say I am heating water. I am providing lit gas underneath the water's vessel. So it expands with the heat energy in it. Now it is expanded. Now it has the heat energy in it. The energy starts slipping from it: when it cools, it gets compressed ie it loses its expansion. Once it's cooler, it's less expanded. We know this from practical experience. Introducing heat energy into a simple system such as a pot of water expands all involved as it gets hotter.

If the universe is expanding, then the process of being heated hasn't been completed yet, in which case it is still getting hotter. If it has expanded, then the process of being heated has finished, and it will cool (lose heat energy and start un-expanding or in my language - compressing)

By stating "the UNIVERSE" is expanding, it would follow that the whole thing is expanding. The earth is included in this.

My question is - if it IS expanding, where is the energy coming from to do this - outside of the universe if we're looking at our example. As I can't comprehend what the universe is, I can't comprehend something that's endless.

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