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Jupiter's Great Red Spot
On Tuesday, July 18, 2017 at 1:40:25 AM UTC-7, David DeLaney wrote:
On 2017-07-11, Greg Goss wrote: (Dorothy J Heydt) wrote: As for the colors of planets (as seen through atmosphrere from Earth, mind you), 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. 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. so some souls came by Sirius B, aka Planet Silius a white dwarf Three red objects? How about Antares ("not Mars") and Betelguese? 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. Would require fairly coincidental timing, but we already know we had that with nearby _super_novae, a drought of which lasted from juuuust before the invention of the telescope (Kepler's, 1604) to a few decades ago when SN1987A popped in the Large Magellanic Cloud (and also showed up through neutrino astronomy). So not actually impossible. Dave, of course a nebular remnant should be visible and as far as I know isn't, but maybe alien space bats -- \/David DeLaney posting thru EarthLink - "It's not the pot that grows the flower It's not the clock that slows the hour The definition's plain for anyone to see Love is all it takes to make a family" - R&P. VISUALIZE HAPPYNET VRbeableBLINK gatekeeper.vic.com/~dbd - net.legends FAQ & Magic / I WUV you in all CAPS! --K. |
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