Received: by alpheratz.cpm.aca.mmu.ac.uk id HAA02968 (8.6.9/5.3[ref firstname.lastname@example.org] for cpm.aca.mmu.ac.uk from email@example.com); Mon, 28 Jan 2002 07:01:30 GMT Date: Sun, 27 Jan 2002 22:57:12 -0800 Message-Id: <200201280657.g0S6vCi23385@mail21.bigmailbox.com> Content-Type: text/plain Content-Disposition: inline Content-Transfer-Encoding: binary X-Mailer: MIME-tools 4.104 (Entity 4.116) X-Originating-Ip: [184.108.40.206] From: "Joe Dees" <firstname.lastname@example.org> To: email@example.com Subject: RE: Light and the Big Bang Sender: firstname.lastname@example.org Precedence: bulk Reply-To: email@example.com('binary' encoding is not supported, stored as-is)
> "Dace" <firstname.lastname@example.org> <email@example.com> Light and the Big BangDate: Sun, 27 Jan 2002 12:52:43 -0800
>> Hi Dace -
>> >It's common knowledge among physicists, astronomers,
>> >cosmologists, etc., that light didn't appear until 300,00 years after
>> >the big bang (though I recently saw this figure upped to 400,000,
>> >unfortunately without any explanation for the revised figure).
>> The cosmic background radiation that we can detect, yes, began at
>> that time. It is a space-time boundary caused by the scattering
>> qualities of photons and the nature of the early universe. It's not that
>> light (photons) was not there, but that it was undetectable.
>You're reducing light to photons. This is not quite correct. Photons only
>constitute light when they're allowed to travel freely across space in
>waves. When photons and electrons are bound together in a single substance,
>there can be neither light nor anything for the light to illuminate.
>> The behavior of CMB photons moving through the early universe is
>> analogous to the propagation of optical light through the Earth's
>> atmosphere. Water droplets in a cloud are very effective at scattering
>> light, while optical light moves freely through clear air. Thus, on a
>> cloudy day, we can look through the air out towards the clouds, but can
>> not see through the opaque clouds.
>The sun casts light onto the clouds, at which point the light is scattered.
>In the early universe, on the other hand, there was never any light in the
>first place that could then be scattered. Right from the get-go, photons
>were bound up with electrons and unable to form into light rays.
>What this illustrates is that there are two kinds of darkness. The darkness
>we're accustomed to is simply the absence of light. The darkness of the
>early universe is the creation of light. This is why the interior of the
>sun is dark. Light cannot exist in the process of its own generation.
The universe cooled enough to permit light or other detectable radiant forms to exist long before it cooled enough to allow matter to coalesce.
>This was distributed via the memetics list associated with the
>Journal of Memetics - Evolutionary Models of Information Transmission
>For information about the journal and the list (e.g. unsubscribing)
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This was distributed via the memetics list associated with the
Journal of Memetics - Evolutionary Models of Information Transmission
For information about the journal and the list (e.g. unsubscribing)
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