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John Stott @jpsastro.bsky.social · 16h

In this galaxy cluster merger the galaxies are located in the red shaded regions with the majority of the mass. The pink region in the middle is where the gas lies. This proves the existence of a missing dark matter 😉🧪🔭 #extragalactic #cosmology

David Blanchard @davidblanchard.bsky.social · 1d

Models have been showing this major rain event for many days now. Rainfall amounts >2" are likely over the higher terrain. It will be interesting to see the measured maximum rainfall amounts.

This forecast graphic is from NOAA/Weather Prediction Center.

BE SAFE!

#azwx #weather #arizona

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John Stott @jpsastro.bsky.social · 23h

Our JELS paper on galaxy sizes (stellar and Halpha) and merger rates at z=6 using NB JWST data has now been accepted for publication. Congratulations @hmostevo.bsky.social 🧪🔭 #extragalactic #academicsky

Harry Stephenson @hmostevo.bsky.social · 29d

Hello everyone! My first Bluesky posts!

I am very pleased to share that my 3rd first-author paper of my PhD is now available on arXiv! The paper has also been submitted to MNRAS following minor suggested revisions from the anonymous referee!

arxiv.org/abs/2509.08045

Thread on the details 🧵

The \emph{JWST} Emission Line Survey (JELS): The sizes and merger fraction of star-forming galaxies during the Epoch of Reionization

We used observations from the \emph{JWST} Emission Line Survey (JELS) to measure the half-light radii ($r_{e}$) of 23 H$α$-emitting star-forming (SF) galaxies at $z=6.1$ in the PRIMER/COSMOS field. Ga...

arxiv.org

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John Stott @jpsastro.bsky.social · 1d

Not read the paper yet but this looks v cool

Corey S. Powell @coreyspowell.bsky.social · 1d

Astronomers have detected a dark blob of...something, billions of light years away. It's as massive as a million Suns & it emits no detectable radiation.

It might be a clump of dark matter, revealing new details about the structure of the invisible universe. 🧪🔭

www.ucdavis.edu/news/astrono...

Left, our best surface brightness model of the 1.7-GHz global VLBI observation used here, which has been reconvolved with the main lobe of the interferometer’s point spread function and added to the residuals (34 μJy per beam r.m.s.). For reference, red contours show the surface brightness at 2.1 μm observed by the W. M. Keck Observatory adaptive optics system30. The positions of two low-mass perturbers are each marked with a black X. The 2 × 108 M⊙ object first detected by ref. 24 is labelled , and the 1.13 × 106 M⊙ detection reported here is labelled . The zoomed-in region shown in the right-hand two panels is indicated by the black square, which has a side length of 60 mas. Top right, detail of the bright arc around , with the colour scale modified to emphasize the gap in the arc produced by the gravitational perturbation of . Bottom right, GI corrections to the lensing convergence (expressed in units of lens-plane surface mass density), showing a compact, positive feature whose position and mass are consistent with the independent parametric modelling results for . The dashed black circle has a radius of 80 pc and the lensed emission is indicated by the black contours.

John Stott @jpsastro.bsky.social · 7d

My reasoning is if aliens came down tomorrow and asked us how we’d been getting on with discovery it would be embarrassing if we didn’t know much.

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Reposted by John Stott

ianVisits @ianvisits.co.uk · 7d

In memoriam...

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John Stott @jpsastro.bsky.social · 7d

😳

Unofficial BBCNews (World) Bot @bbcnews-world-rss.bsky.social · 8d

Japan faces Asahi beer shortage after cyber-attack

The drinks giant said this week that the attack had a major impact on its domestic operations.

www.bbc.com

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Reposted by John Stott

Melina Thévenot🏳️‍⚧️ @melina-iras07572.bsky.social · 8d

#Galaxy cluster ACO S 1121 (SPTJ2325-41) with #JWST NIRCam.

Filters: F277W, F356W, F444W

program: www.stsci.edu/jwst-program...

Galaxy cluster with lots of blue galaxies, lensing mostly brown background galaxies into arcs around the cluster.

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John Stott @jpsastro.bsky.social · 9d

Avoid plagiarism by performing your own research and reading around the background literature, such that you can write your own original sentences. #academicsky

sentence rewriter @sentencerewriter.bsky.social · 9d

Avoid plagiarism problems in academic writing by using a sentence rewriter. AI simplifies complex sentences and keeps your work unique.
sentencerewriter.co

#SentenceRewriter #AIWriter #PlagiarismFree #AcademicWriting #ResearchHelp #StudyTips #ContentTools

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John Stott @jpsastro.bsky.social · 9d

It's that time of year when my alma mater asks me for money when they have far more money than my own institution (factor of 300 in value of the respective endowments). They also used to ask me for it when I worked for them which seemed a little cheeky. #academicsky

bugs bunny is sitting at a table with a purse and stacks of money

Alt: bugs bunny is sitting at a table with a purse and stacks of money

media.tenor.com

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Reposted by John Stott

Melina Thévenot🏳️‍⚧️ @melina-iras07572.bsky.social · 11d

Two gravitational lens candidates from the North ecliptic pole EXtragalactic Unified Survey (NEXUS).

#JWST 🔭 NIRCam image (filters: F200W, F444W)

program: www.stsci.edu/jwst-program...

Two edge-on galaxies with a ring around their center.

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John Stott @jpsastro.bsky.social · 15d

Yeh my students who use LLMs for the short essay style questions in coursework always do badly as I want them to talk around the specific points Ive taught them. Not what gpt thinks.

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John Stott @jpsastro.bsky.social · 16d

Trying boy band cosmology/astro puns and it's not really happening...
New Kids on the Bok (globule)
Make(make) That
Boy(habitable)zone

(although according to google there's already boy band called Big Bang)
🧪🔭

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Reposted by John Stott

Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 17d

Inner child extremely excited about a crewed mission to the moon as soon as February!
Outer adult painfully aware of the NASA funding cuts and their impact on wide-ranging and incredibly important scientific research.
Anyone else simultaneously thrilled and downcast about this news?🔭🛰️

Ars Technica @arstechnica.com · 17d

NASA targeting early February for Artemis II mission to the Moon

“There is a desire for us to be the first to return to the surface of the Moon.”…

arstechnica.com

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John Stott @jpsastro.bsky.social · 17d

yep

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John Stott @jpsastro.bsky.social · 17d

MS Teams telling me it no longer works unless I upgrade my OS... don't threaten me with a good time 🧪 #academicsky

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Reposted by John Stott

Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 18d

⏰ Start your countdown clock for the exact moment of the autumn #equinox, 19:19 (UK) 22nd Sept, when the Northern hemisphere and Southern hemisphere are equally illuminated. Today the day length in 🏴󠁧󠁢󠁳󠁣󠁴󠁿Scotland is ~the same as in 🇳🇿New Zealand 🤓🧪🔭

📷: National Maritime Museum, Greenwich

The main diagram shows the Earth's annual rotation around the Sun, surrounded by a zodiacal scale that gives the names, symbols and images of the signs of the zodiac. The seasons and the positions of the equinoxes and solstices are marked. Text at the corners describes the Zodiac and the Earth, and a longer text at the bottom explains the Phenomena of the Seasons.

From https://collections.rmg.co.uk/media/501/182/l1073_001.jpg

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John Stott @jpsastro.bsky.social · 21d

10 years since I decided it looked like a crocodile 😀🔭🧪

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John Stott @jpsastro.bsky.social · 21d

Trent Reznor takes a seat from Labour!

Britain Elects @britainelects.com · 21d

❗ Newham Independents GAIN from Labour

Yesterday's Plaistow South (Newham) council by-election result:

NIN: 44.7% (+44.7)
LAB: 21.4% (-34.0)
REF: 16.1% (+16.1)
GRN: 7.4% (-8.4)
CON: 6.0% (-11.5)
LDEM: 4.4% (-6.9)

+/- 2022

Estimated turnout: ~25% (-5)

andrewteale.me.uk/previews

Andrew’s Previews | Andrew Teale | Substack

"All the right votes, but not necessarily in the right order". Click to read Andrew’s Previews, by Andrew Teale, a Substack publication with thousands of subscribers.

andrewteale.me.uk

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John Stott @jpsastro.bsky.social · 21d

She clearly doesn’t understand how the oil and gas market works… or is advocating for nationalising an oil company which seems highly unlikely 😂

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John Stott @jpsastro.bsky.social · 24d

Yes, looking at old documentaries, it's pure content for the whole episode... none of this: here's what I'm going to tell you, here's what I've just told you, such that an hour documentary is only 20mins of new material.

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Reposted by John Stott

arXiv astro-ph.GA Astrophysics of Galaxies @astrophga-bot.bsky.social · Sep 11

H. M. O. Stephenson, et al.: The \emph{JWST} Emission Line Survey (JELS): The sizes and merger fraction of star-forming galaxies during the Epoch of Reionization https://arxiv.org/abs/2509.08045 https://arxiv.org/pdf/2509.08045 https://arxiv.org/html/2509.08045

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John Stott @jpsastro.bsky.social · 27d

There will be on Nov 1st

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John Stott @jpsastro.bsky.social · 27d

I know you lot love this, but why am I seeing halloween cakes in mid september? 🙄

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John Stott @jpsastro.bsky.social · 29d

so true!

John Stott @jpsastro.bsky.social · 29d

🧪🔭 #extragalactic

Harry Stephenson @hmostevo.bsky.social · 29d

Hello everyone! My first Bluesky posts!

I am very pleased to share that my 3rd first-author paper of my PhD is now available on arXiv! The paper has also been submitted to MNRAS following minor suggested revisions from the anonymous referee!

arxiv.org/abs/2509.08045

Thread on the details 🧵

The \emph{JWST} Emission Line Survey (JELS): The sizes and merger fraction of star-forming galaxies during the Epoch of Reionization

We used observations from the \emph{JWST} Emission Line Survey (JELS) to measure the half-light radii ($r_{e}$) of 23 H$α$-emitting star-forming (SF) galaxies at $z=6.1$ in the PRIMER/COSMOS field. Ga...

arxiv.org

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