[ExI] Fermi question, possible answer
protokol2020 at gmail.com
Sat Apr 4 07:17:08 UTC 2015
It is possible, that the astronomy (physics) does not provide a big enough
number in the first place.
Yes, there may be 10^23 stars in the visible universe. But a star is not
enough. Must be a much more peculiar one, that once thought it has to be.
What is known as the faint sun paradox - why was so warm on Earth back when
our Sun was much fainter - has a strange answer. Be cause our planet
Yes, that's right. A faster rotating planet is warmer! Despite the common
knowledge, of course.
Gradually this rotation slowed, just as the Sun got warmer in its natural
cycle. Quite a synchronicity was needed!
And it is very likely that then the Universe was not able to provide a very
big number of systems capable of life. Biology had nothing to begin with.
On Wed, Apr 1, 2015 at 7:28 PM, John Clark <johnkclark at gmail.com> wrote:
> On Mon, Mar 23, 2015 BillK <pharos at gmail.com> wrote:
>> > This universe seems to be 'designed' for life creation so
>> that primitive life appears wherever there is a chance.
> Maybe not. We only have one example to examine and it's true that life
> started on Earth almost as soon as the Earth formed 4.5 billion years ago,
> but that could be freakishly early. This isn't just any old planet that
> supports life, it supports intelligent life. If it had taken just 800
> million years longer for life to get started then right about now the sun
> would start to get off the main sequence and would get so hot that complex
> organisms could no longer exist on the Earth.
>> > Advancing to intelligent life may well require another chain of
>> unlikely events,
> The sort of cells that all complex life is made of, Eukaryotic cells,
> evolved about 2 billion years ago and some think that was even more
> unlikely than the origin of life itself.
>> > but the universe is a pretty big place.
> It all comes down to which can generate bigger numbers, astronomy or
> John K Clark
> extropy-chat mailing list
> extropy-chat at lists.extropy.org
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