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#bigbangtheory

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Tom Zijlstra

sailing-dulce.nl/home/article- #jadesgsz140 #earlymatter #bigbangtheory #Netanyahu #ShinBet #HighCourt #heatrecord Vrijdag 21-03-2025 Vaste lezers kennen mijn fascinatie voor de vroegste fase van het heelal. De James Webb ruimtetelescoop doet er regelmatig verrassende ontdekkingen, maar dat kunnen telescopen op aarde ook. Van de week werd bekend dat twee teams van astronomen zuurstof hebben ontdekt in het tot dusver verst bekende sterrenstelsel, JADES-GS-z14-0. De ontdekking, die in twee afzonderlijk..

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Michael Porter

A question for the cosmologists. (I was going to say "Explain like I'm 5", but assume I've spent too much time listening to Katie Mack, Sean Carroll, Brians Greene and Cox, etc. and I have a bit of a clue... But I didn't study relativity, and have no experience with GR math).

Here goes...

Every time I hear "such and such happened at 10^-11 seconds, and a little later this thing happened at 10^-6 seconds" I wonder about the clock you're using.

At various times in the *very* early universe, the energy density was unimaginably huge. I'm assuming that has an effect on the flow of time, as well, no? I know there's no external clock to compare to, but what is the real meaning of these times, other than as a sequence of events, when the environment is undergoing such massive changes in energy density (or matter density, if we're talking a little later)?

I'm basically asking how those times are meaningful to me*, a guy thinking about it at this point in the universe, when the composition/distribution/volume of the observable universe does not faintly resemble that of the universe in the first fractions of a second that we're talking about.

(*Ignore for a moment that we can't comprehend those timespans even if the universe wasn't changing)

Please boost for reach if you are in the astronomy community, I'm not sure which hashtags to use for this...
#Cosmology #Astronomy #BigBangTheory #Relativity

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Michael Porter

I'm preparing to give a cosmology talk to a group of octa- and nonagenarians in a few weeks... The challenge is to give a digestible talk on Big Bang theory to a group of people who are intelligent but mostly uninformed on the topic... In 40 minutes!

When I was asked, I thought, "easy, I've done this for grade 9 students dozens of times" but then found out about the time constraint. I could spend more than 40 minutes just talking about how we came to measuring distances in the cosmos, never mind the evolution of it.

Never mind the technical details, I could spend 40 minutes just reviewing how our view of the universe has expanded from just our solar system, with a celstial sphere just beyond Saturn, to thinking the Milky Way *was* the universe, to where we are now, observing the vast billions-of-light-years-wide bubble that is our observatble universe.

Or how about talking about the evolution of tehcnology (never mind the evolution of the necessary mindsets!) that made the observations possible?

Geez, just explaining line spectra and redshift could take 40 minutes.

I'm tempted to prepare talks on everything and present the talk as a "choose your own adventure" book. Maybe they'll have me back to explore the paths not taken?

Any advice on how the astro communicators would approach this is welcome (or suggestions for perspcetives I might have missed!).

A colorized version of the "Flammarion Engraving." Description from Wikipedia: The illustration depicts a man, dressed as a pilgrim in a long robe and carrying a walking stick, who has reached a point where the flat Earth meets the firmament. The pilgrim kneels down and passes his head, shoulders, right arm, and the top of the walking stick through an opening in the firmament, which is depicted as covered on the inside by the stars, Sun, and Moon. Behind the sky, the pilgrim finds a marvelous realm of circling clouds, fires and suns. One of the elements of the cosmic machinery resembles traditional pictorial representations of the "wheel in the middle of a wheel" described in the visions of the Hebrew prophet Ezekiel. https://en.wikipedia.org/wiki/Flammarion_engraving
#Astronomy#Cosmology#ITeachScience
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Spocko

#BigBangTheory S1.E15
Sheldon's twin sister is asked to spend the night.

"I don't think so, Shelly doesn't like company, even as a little boy he'd send his imaginary friends home at the end of the day."

Sheldon replies, "They were not friends, they were imaginary colleagues."
Teleplay by Lee Aronsohn & Bill Prady,
Chuck Lorre, story
The Pork Chop Indeterminacy, Aired May 5, 2008 m.imdb.com/title/tt1127906/ful

Until she met them in person, Mrs. Spocko referred to my "Imaginary internet friends"

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