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Prof Anna Watts

@profannawatts

Professor of Astrophysics @ Univ. of Amsterdam. Neutron stars, pulsars, dense matter, X-ray astronomy. Mom, Migrant. "Particles in stars blah blah". Does science with NICER on the International Space Station and schemes for EVEN BIGGER SPACE TELESCOPES.

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Latest posts by Prof Anna Watts @profannawatts

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Ja, waarom? De korte versie: boeren in intensieve landbouw kunnen alleen overleven door steeds verder op te schalen. Dus pakken ze de sloten erbij. Desnoods illegaal en ten koste van biodiversiteit.

Mooie illustratie van @laurensvangurp.bsky.social VK (hoewel: realiteit is meer plaatje 2).

07.03.2026 11:25 πŸ‘ 40 πŸ” 12 πŸ’¬ 1 πŸ“Œ 1
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Kabinetsplannen om vaderschapsverlof te versoberen 'stap terug voor gendergelijkheid' Een vader kan 44 procent van zijn inkomen kwijtraken als hij met verlof gaat. "Geen verstandige keuze als je gendergelijkheid wilt bevorderen", zegt een onderzoeker.

Kabinetsplannen om vaderschapsverlof te versoberen 'stap terug voor gendergelijkheid' - nos.nl/l/2605267

07.03.2026 06:44 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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a ground squirrel standing on its hind legs with buckets written on a wooden surface Alt: a ground squirrel standing on its hind legs with buckets written on a wooden surface

I have now identified more than 100 bloody buckets just to be allowed to read journal papers in SciX.

06.03.2026 10:37 πŸ‘ 8 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

ai:du This makes me so angry and sad. 😑😒

05.03.2026 15:07 πŸ‘ 7 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0
A group of astronomers peering at a rack of compute nodes.

A group of astronomers peering at a rack of compute nodes.

A huge treat to get a tour of Dutch supercomputer Snellius as part of our X-PSI team hack week! A chance to salute the hard-working nodes in person. Thank you @itcooperativesurf.bsky.social !

04.03.2026 21:42 πŸ‘ 12 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

Why does quantum chromodynamics get quote marks?! It's a real thing! And definitely easier to understand than American politics.

02.03.2026 17:27 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
A NICER View of PSR J0030+0451: Updated Constraints from Six Years of NICER Observations This dataset contains posterior samples from a Bayesian inference analysis of X-ray observations of PSR J0030+0451 using the PDT-U model. The inference was performed using theΒ MultiNest nested samplin...

You can already find the mass-radius samples for our headline run in a Zenodo. We'll update this with a full reproduction package in due course!

zenodo.org/records/1874...

02.03.2026 15:47 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Egg colours 
Purple: chocolate goop
Blue: nuts? Indeterminate 
Teal/green : crunchy white stuff ( vanilla)
Pink: strawberry 
Dark orange: white choc and caramel

Egg colours Purple: chocolate goop Blue: nuts? Indeterminate Teal/green : crunchy white stuff ( vanilla) Pink: strawberry Dark orange: white choc and caramel

X-PSI spring hack week is underway! The most important part of the hack board? Identifying the chocolate egg flavours in the hack snack tin.

02.03.2026 12:30 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

The results are - incoming pun klaxon - much nicer! Results for the different geometric models are more consistent, and tension with other results, for the statistically preferred model, is reduced. Phew!

02.03.2026 07:30 πŸ‘ 7 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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A NICER View of PSR J0030+0451: Updated Constraints from Six Years of NICER Observations Pulse-profile modeling of rotation-powered millisecond pulsars targeted by NICER has enabled mass--radius constraints of several neutron star sources, with implications for the dense-matter equation o...

New NICER neutron star results this morning, led by Yves Kini! For the first rotation-powered millisecond pulsar we ever reported on, PSR J0030+0451.

More data (6 years!), background constraints fully incorporated, and improved sampling. #highenergyastro πŸ”­πŸ§ͺ

arxiv.org/abs/2602.23743

02.03.2026 07:26 πŸ‘ 21 πŸ” 6 πŸ’¬ 2 πŸ“Œ 0
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a man wearing a vest and tie stands in front of a group of men with the word apollo 13 on the bottom Alt: Control room, Apollo 13 movie, Gene is standing and saying "good job"

Family movie night, Apollo 13. Kids - thankfully - loved it. There would otherwise have been ructions.

28.02.2026 21:51 πŸ‘ 16 πŸ” 1 πŸ’¬ 3 πŸ“Œ 0
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The American-Israeli Strikes on Iran are (Again) Manifestly Illegal After weeks of threats, the United States, joined by Israel, has launched military strikes against Iran. It remains to be seen whether these strikes will be fairly limited, or are the opening of an ex...

Unsurprisingly, Marko has already written something… /3 www.ejiltalk.org/the-american...

28.02.2026 08:49 πŸ‘ 29 πŸ” 9 πŸ’¬ 2 πŸ“Œ 0
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Dame Carole Jordan – first female president of the RAS – 1941-2026 We are saddened to hear of the death of Professor Dame Carole Jordan – the first female president of the Royal Astronomical Society (RAS) – who has passed away a...

A trailblazer (which I did not appreciate enough when I sat in her lectures!).

ras.ac.uk/news-and-pre...

28.02.2026 05:10 πŸ‘ 875 πŸ” 205 πŸ’¬ 6 πŸ“Œ 5
Sigh saying E = m c squared
Energy = milk times coffee squared

Sigh saying E = m c squared Energy = milk times coffee squared

Wise words from the hoardings on the building site of the new Graz Centre for Physics

27.02.2026 09:53 πŸ‘ 17 πŸ” 5 πŸ’¬ 3 πŸ“Œ 0

I've been aware of this impending change - which hits my dual national kids - for months, as soon as I realised I couldn't get them an ETA on their Dutch passports. I am quite bemused that many of my friends missed it.

But they *did*, and the consequences suck... so fixing it seems wise?

26.02.2026 19:46 πŸ‘ 6 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Plaque saying " Ihrem mitgleide in den jahren 1869-1873 und 1876-1890 Ludwig Boltzmann die philosophische fakultΓ€t der universitΓ€t Graz"

Plaque saying " Ihrem mitgleide in den jahren 1869-1873 und 1876-1890 Ludwig Boltzmann die philosophische fakultΓ€t der universitΓ€t Graz"

Hanging out with the Big Physics Cheeses in Graz....

26.02.2026 15:51 πŸ‘ 14 πŸ” 1 πŸ’¬ 1 πŸ“Œ 1

It's awful isn't it?

26.02.2026 11:41 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Leader of Columbia Brain Institute Quits Over Friendship With Epstein

Gift link from the NYT story about Axel and Epstein. When I was at Columbia he ran a lab where sexual harassment of women was business as usual. We all knew. We all warned each other.

www.nytimes.com/2026/02/25/n...

25.02.2026 06:12 πŸ‘ 155 πŸ” 89 πŸ’¬ 12 πŸ“Œ 18

Not open to anyone needing a visa, is that right?

24.02.2026 21:31 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Ik begrijp dat de inkrimping van de veestapel afhangt van de vraag of β€˜we de
boeren meekrijgen’. Dat hoor je nou nooit bij bezuinigingen in de zorg of sociale zekerheid. Dan maakt het niets uit wat de betrokkenen ervan vinden.

23.02.2026 19:13 πŸ‘ 890 πŸ” 343 πŸ’¬ 33 πŸ“Œ 25

Our institute is being renovated so we're packing up to move to a temporary location. Cue a LOT of clearing up....

24.02.2026 16:51 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Well maybe reading a final draft of a PhD thesis to a little BLΞ›Ζ†KPIИK? It's a tough one.....

24.02.2026 12:49 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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a woman in a white shirt is sitting in front of a window with her hands outstretched . Alt: Marie Kondo, tidying guru extraordinaire, is bowing. She too, doubtless hates the piles of old exam scripts that litter the office of every Dutch academic.

Does anything spark more joy than despatching old exams to the shredder? I think not.

24.02.2026 12:26 πŸ‘ 7 πŸ” 0 πŸ’¬ 3 πŸ“Œ 0

β€œMooie woorden, weinig daden”, kopt Volkskrant. Met de huidige plannen worden klimaat- en stikstofdoelen niet gehaald. Die conclusie trekt PBL op basis van het coalitieakkoord dat vol ambitieuze woorden staat. Het verschil tussen cijfers en woorden.

22.02.2026 09:53 πŸ‘ 111 πŸ” 44 πŸ’¬ 9 πŸ“Œ 2

YES! I used to do this and it was amazing for mom sanity. Light pottering and coffee in town, maybe a pedicure? Bliss.

16.02.2026 17:29 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Read the whole thread. Then pre-order Chanda’s book.

I haven’t yet gone looking to see if the professors who ultimately convinced me that higher ed wasn’t a place I wanted to be due to their behavior are in the files. But what Chanda says resonates deeply nonetheless.

16.02.2026 15:53 πŸ‘ 16 πŸ” 7 πŸ’¬ 2 πŸ“Œ 0

Oh I'm so sorry to hear this! Give that poor kitty baby all the hugs.

15.02.2026 19:15 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Chart of Physics doctorates earned from 1978 to 2024, with a steady increase in the number of women but overarching trends closely tracking the number of men earning PhDs

Chart of Physics doctorates earned from 1978 to 2024, with a steady increase in the number of women but overarching trends closely tracking the number of men earning PhDs

Chart showing doctorates earned in astronomy from 1978 to 2024 with women making steady gains and closing in on parity, and an overarching increase in number of PhDs earned linked to the increasing numbers of women entering the field.

Chart showing doctorates earned in astronomy from 1978 to 2024 with women making steady gains and closing in on parity, and an overarching increase in number of PhDs earned linked to the increasing numbers of women entering the field.

The AIP stats team has released its latest data of physics & astronomy PhD trends, with breakdown by gender. What is extraordinary to me is how clearly the overall trends exhibit an important gender dimension, and that that story is quite different between physics and astronomy.

11.02.2026 21:58 πŸ‘ 131 πŸ” 36 πŸ’¬ 9 πŸ“Œ 8

That's awful. I'm so sorry.

11.02.2026 21:22 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

We have fondued. It was spectacular. #Bern

11.02.2026 21:21 πŸ‘ 34 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0