RE: accelerating universe and Leslie constraints

Julian Leviston (
Mon, 29 Mar 1999 12:24:29 +1000

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...?


At 08:51 AM 26/03/99 -0600, Billy Brown wrote:
>Damien Broderick wrote:
>> Indeed, I wonder if it has any salience to the traditional explanation for
>> Olber's paradox. Might the universe be eternal after all, except for
>> bubbles like our own that are observable only under (somewhat) anthropic
>> conditions?
>That makes sense to me.
>Of course, there are other ways that the universe could be eternal without
>causing a problem:
>1) If the universe is eternal but constantly expanding, cosmic red shift
>will render anything beyond a certain distance effectively invisible.
>2) If the universe contains significant expanses of something that eats
>light without re-emitting it (black holes, for instance), they could act as
>observation barriers and allow an infinite universe to appear finite.
>3) If new, connected regions of space-time are constantly being created
>(i.e. the big bang was not unique), you would have large areas that have not
>been saturated by light from arbitrarily distant sources.
>I think there were a few other options, but I can't remember them at the
>Billy Brown, MCSE+I

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