Re: Jupiter's Great Red Spot

Newsgroups	sci.physics, sci.physics.relativity, rec.arts.sf.written, alt.astronomy
From	David DeLaney <daviddelaney@earthlink.net>
Subject	Re: Jupiter's Great Red Spot
References	<595A82D3.1A46@ix.netcom.com> <osKLEA.1so6@kithrup.com> <esk0u5Fsb0eU2@mid.individual.net> <esqdnb_Sa6rvVPDEnZ2dnUU7-UfNnZ2d@earthlink.com> <otAHwq.14zF@kithrup.com>
Organization	Extremely dis
Message-ID	<64-dnWGI6qNLwPPEnZ2dnUU7-RnNnZ2d@earthlink.com> (permalink)
Date	2017-07-18 14:13 -0500

Cross-posted to 4 groups.

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On 2017-07-18, Dorothy J Heydt <djheydt@kithrup.com> wrote:
> David DeLaney  <dbd@vic.com> wrote:
>>Astrophysics does have a hypothesis to cover that: namely, that in historical
>>times Sirius B was a red giant, that there was a nova (which doesn't seem to
>>have been recorded, but historical astronomy records are spotty in places),
>>which led to it becoming the white dwarf we currently see.
>
> But what about the big blue supergiant that we now see?

That's its partner, Sirius A, is it not?  ... no, Sirius A is a white main-
sequence, near our Sun's brightness, and is only the brightest visible star
for us because of its closeness. (And Wikipedia spikes my hypothesis,
apparently ~120 million years ago is currently accepted for Sirius B's nova.
Bah, back to the stellar-placement Lite-Brite!)

> Coincidences do happen.  I can see a supernova happening *just*
> long enough ago that its light shines on Earth and fades out
> *just* before anybody has a telescope.  But what about the big
> blue supergiant?

I am now not at all sure what you may be referring to. Checking, our nearest
known Big Blue is Rigel, in Orion, about 20 times Sol's mass. There is one in
Canis Major about 2000 light years away, but it's not Sirius.

> Is there an astrophysicist in the house?

Dave, no longer even plays a cousin of one in the sciences
-- 
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It's not the clock that	slows the hour 	The definition's plain for anyone to see
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gatekeeper.vic.com/~dbd	- net.legends FAQ & Magic / I WUV you in all CAPS! --K.

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Re: Jupiter's Great Red Spot David DeLaney <daviddelaney@earthlink.net> - 2017-07-18 03:40 -0500
  Re: Jupiter's Great Red Spot djheydt@kithrup.com (Dorothy J Heydt) - 2017-07-18 14:07 +0000
    Re: Jupiter's Great Red Spot Robert Woodward <robertaw@drizzle.com> - 2017-07-18 09:02 -0700
    Re: Jupiter's Great Red Spot David DeLaney <daviddelaney@earthlink.net> - 2017-07-18 14:13 -0500

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