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Re: Jupiter's Great Red Spot

Cross-posted to 4 groups.

Followups directed to: sci.astro

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Dorothy J Heydt amok-crossposted across 4 newsgroups, 1 outside the Big 8:

> […] there used to be a saying among classic (I mean Greco-Roman times),
> that three astronomical objects shone red: Sirius, Mars, and Jupiter (but
> not as red)  Sirius is certainly not red today, and current astrophysics
> has no explanation for a star turning from bright red to bright blue-
> white.  […]

Yes, it has.  For example, there is the Asymptotic Giant Branch (AGB) where 
a *red* giant becomes a *white* dwarf (a blue tinge can also be caused by 
Terra’s atmosphere).

In fact, this is a *very* common development [“undertaken by *all* low- to 
intermediate-mass stars (0.6–10 solar masses)”; emphasis mine] and will 
likely happen to Sol (the Sun), which is currently a yellow dwarf (G2Ⅴ), 
will become a red giant (probably M), and end as a white dwarf (A), in about 
5 billion years (short scale) from now.

<https://en.wikipedia.org/wiki/Asymptotic_giant_branch#/media/File:Evolutionary_track_1m.svg>

> If ever I meet an astrophysicist, I'll ask him/her, "What's your
> hypothesis," and if the answer is "I haven't got one," I'll take
> that as an honest answer.

I am not an astrophysicist (yet?), but I know a bit about stars.
 
F’up2 sci.astro

-- 
PointedEars

Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

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Jupiter's Great Red Spot  The Starmaker <starmaker@ix.netcom.com> - 2017-07-03 10:45 -0700
  Jupiter's Great Red Spot "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2017-07-03 11:40 -0700
  Re: Jupiter's Great Red Spot Whisper <beaver999@ozemail.com> - 2017-07-04 21:22 +1000
    Re: Jupiter's Great Red Spot Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-07-04 15:03 +0200
    Re: Jupiter's Great Red Spot djheydt@kithrup.com (Dorothy J Heydt) - 2017-07-04 14:25 +0000
      Re: Jupiter's Great Red Spot Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-07-04 18:08 +0200
      Re: Jupiter's Great Red Spot Greg Goss <gossg@gossg.org> - 2017-07-11 07:08 -0600
    Re: Jupiter's Great Red Spot The Starmaker <starmaker@ix.netcom.com> - 2017-07-04 12:13 -0700
      Re: Jupiter's Great Red Spot Whisper <beaver999@ozemail.com> - 2017-07-05 19:29 +1000
        Re: Jupiter's Great Red Spot The Starmaker <starmaker@ix.netcom.com> - 2017-07-05 11:39 -0700
          Re: Jupiter's Great Red Spot The Starmaker <starmaker@ix.netcom.com> - 2017-07-08 12:22 -0700
  Re: Jupiter's Great Red Spot  Hägar <hsahm@yahoo.com> - 2017-07-04 08:31 -0700

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