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[Phys-L] Bernard, please explain

Bernard, I just came across this photo on Twitter. Can you explain this demonstration?




-----Original Message-----
From: bernard cleyet <bernard@cleyet.org>
To: phys-l@mail.phys-l.org
Cc: nancyseese@redshift.com <nancyseese@redshift.com>
Sent: Sun, Dec 20, 2020 10:30 pm
Subject: [Phys-L] more accurate parallax and an astronomy lesson


Courtesy of "Wired”.

https://www.wired.com/story/the-universe-is-expanding-faster-than-expected/?bxid=5df54c65fbd297755b01592d&bxid=5df54c65fbd297755b01592d&cndid=59387573&cndid=59387573&esrc=profile-page&esrc=profile-page&hasha=65314f42516e94610d8a570212ba4fd3&hasha=65314f42516e94610d8a570212ba4fd3&hashb=de73c5cff25ac189de26d3f65fe5b15424589e57&hashb=de73c5cff25ac189de26d3f65fe5b15424589e57&hashc=4bdac20e3d55f860dcc1656b950b348ee391b3fd57fa7338986ee194fc0cadfa&hashc=4bdac20e3d55f860dcc1656b950b348ee391b3fd57fa7338986ee194fc0cadfa&source=EDT_WIR_NEWSLETTER_0_DAILY_ZZ&source=EDT_WIR_NEWSLETTER_0_DAILY_ZZ&utm_brand=wired&utm_brand=wired&utm_campaign=aud-dev&utm_campaign=aud-dev&utm_content=Final&utm_content=Final&utm_mailing=WIR_Daily_122020&utm_mailing=WIR_Daily_122020&utm_medium=email&utm_medium=email&utm_source=nl&utm_source=nl&utm_term=list1_p2&utm_term=list1_p2 <https://www.wired.com/story/the-universe-is-expanding-faster-than-expected/?bxid=5df54c65fbd297755b01592d&bxid=5df54c65fbd297755b01592d&cndid=59387573&cndid=59387573&esrc=profile-page&esrc=profile-page&hasha=65314f42516e94610d8a570212ba4fd3&hasha=65314f42516e94610d8a570212ba4fd3&hashb=de73c5cff25ac189de26d3f65fe5b15424589e57&hashb=de73c5cff25ac189de26d3f65fe5b15424589e57&hashc=4bdac20e3d55f860dcc1656b950b348ee391b3fd57fa7338986ee194fc0cadfa&hashc=4bdac20e3d55f860dcc1656b950b348ee391b3fd57fa7338986ee194fc0cadfa&source=EDT_WIR_NEWSLETTER_0_DAILY_ZZ&source=EDT_WIR_NEWSLETTER_0_DAILY_ZZ&utm_brand=wired&utm_brand=wired&utm_campaign=aud-dev&utm_campaign=aud-dev&utm_content=Final&utm_content=Final&utm_mailing=WIR_Daily_122020&utm_mailing=WIR_Daily_122020&utm_medium=email&utm_medium=email&utm_source=nl&utm_source=nl&utm_term=list1_p2&utm_term=list1_p2> 


bc 
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