Go to https://brilliant.org/drbecky to get a 30-day free trial and the first 200 people will get 20% off their annual subscription. A new research study has come out claiming that to explain the massive galaxies found at huge distances in James Webb Space Telescope images, the Universe is older than we think, at 26.7 billion years (rather than 13.8 billion years old). In this video I'm diving into that study, looking at what model they used to get at that claim (a combination of the expansion of the universe and "tired light" ideas of redshift), how this impacts our best model of the Universe and the so-called "Crisis is Cosmology", and why I'm not convinced yet!

#astronomy #JWST #cosmology

My previous YouTube video on how JWST’s massive galaxies are no longer “impossible” -    • JWST's "too massive" galaxy problem s...  

Gupta et al. (2023; is the universe 26.7 billion years old?) - https://academic.oup.com/mnras/advanc...
Labbé et al. (2023; over-massive galaxies spotted in JWST data) - https://arxiv.org/pdf/2207.12446.pdf
Arrabal Haro et al. (2023; z~16 candidate galaxy turns out to be z=4.9) - https://arxiv.org/pdf/2303.15431.pdf
Zwicky (1929; "tired light" hypothesis raised for first time) - https://www.pnas.org/doi/epdf/10.1073...


JWST observing schedules (with public access!): https://www.stsci.edu/jwst/science-ex...
JWST data archive: https://mast.stsci.edu/portal/Mashup/...
Twitter bot for JWST current observations:   / jwstobservation  
The successful proposals in Cycle 2 (click on the proposal number and then "public PDF" to see details): https://www.stsci.edu/jwst/science-ex...

00:00 - Introduction: JWST's massive galaxy problem
01:48 - Our current best model of the Universe: λ-CDM
03:16 - The problems with λ-CDM and the "Crisis in Cosmology"
04:28 - Getting distance from redshift
05:13 - A new model of the Universe: a HYBRID of "tired light" and expansion of the Universe
06:25 - The history of "tired light" and why it was eventually dismissed (Tolman Surface Brightness Test)
08:18 - What Gupta (2023) have found
09:30 - The change to the calibration of redshift and distance (and the new age of the Universe)
10:02 - What other problems does this new model help solve?
11:07 - The observational evidence that this new model ignores...
12:39 - How else do we explain JWST's massive galaxy problem? Universal IMF issues
14:35 - Outro: the legacy of JWST
15:23 - Brilliant
16:46 - Bloopers

Video filmed on a Sony ⍺7 IV
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👩🏽‍💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.


http://drbecky.uk.com
https://rebeccasmethurst.co.uk