Happy to be in beautiful Görlitz this week for the Kavli-IAU Global Coordination workshop. Thanks to @samayanissanke.bsky.social and the team for bringing us together.

Crescent moon over Paris

On the last day of our two-month residency at CAS in Oslo, Bing Zhang from IHEP Beijing who’s been here as a member of my group spontaneously joined me for the ecotrail 21K run. It was a wonderful way to say goodbye to Oslo and to conclude our fruitful time here together.

Oslo, I will miss your beautiful lilac trees

A very special afternoon at the Abel Prize ceremony in Oslo. Honoured to witness Gerd Faltings receive the 2026 Abel Prize by Crown Prince Haakon with this wonderful crew.

Jupiter, Venus, and crescent moon on tonight’s flight home. Gratulerer med dagen 🇳🇴

Physicists: please consider signing this open letter of support: nottinghamphysics.github.io/Open_Letter/ The University wants to cut a third of academic and related staff from the School of Physics and Astronomy.

I’ve read many books about black holes, but this is my first one in Norwegian. Also a first: it revolves around a murder at the Institute of Theoretical Astrophysics at the University of Oslo. My colleagues at ITA recommended it, and I’m enjoying it so far! @spmness.bsky.social

One month into my Oslo stay, one of the unexpected highlights has been the nature. In today’s run in Bygdøy I encountered forest, deer, many types of ducks, sea views, which feel unreal just a few km from the city centre.

Send your name to the moon for free with the Artemis mission - deadline for sign up today. https://www3.nasa.gov/send-your-name-with-artemis/#user-information #Astrodon #moon #artemis #astronomy

youtu.be/KsLS2jkxZZE 🔭 AAS Journal Author Series: Glennys Farrar on 2025ApJ 994L 7 Glennys Farrar (New York University) chats about her article on specific predictions of the cutoff energy of various nuclei for binary neutron star mergers being the principle source of ultra-high-energy cosmic rays.

In beautiful Bad Honnef for the 5th Graduate School on Astroparticle Physics indico-sfb1491.epp.physik.tu-dortmund.de/event/87/ove...

Yesterday, I had the privilege to visit the KATRIN experiment at the Karlsruhe Institute of Technology and experience the breathtaking scele of it up close. Many thanks to Dr Markus Steidl for the tour.

Sometimes you stumble over to a packed breakout session at your big annual academic conference and learn that some billionaires have decided to build not one, but FOUR, complementary new telescope facilities, and build them fast Well OK then! Happy new year! From their pockets to our skies! 🔭

Congratulations to Dr Domenik Ehlert for successfully defending his PhD thesis! I could not have asked for a more brilliant first PhD student, and am very excited to see where his work takes him next!

A big milestone today! Domenik Ehlert holding his freshly printed PhD thesis! The defence is in 3 weeks and I couldn’t be prouder of the work that’s gone into this. Congratulations on reaching this stage! The finish line is in sight!

It was wonderful to host Teresa Bister, Damiano Fiorillo, Karri Koljonen, and Bing Theodore Zhang at NTNU to kick-off our Centre of Advanced Study Oslo Collaboration!

Researchers’ Night at NTNU last Friday! Our group brought a 3D-printed mini-array of Auger surface detectors and talked to high school students about cosmic rays and black holes.

During #ICRC2025 we had the immense fortune to be shown around the Jungfraujoch research station. We saw, among other things, the neutron monitor and the guestbook signed by Pierre Auger and his students in 1934-38.

A very nice popular summary of our recent work on whether ultra-high energy cosmic rays may be accelerated in AGN ultrafast outflows by @sbrandslet.bsky.social norwegianscitechnews.com/2025/05/unra...

Polar stratospheric clouds over Trondheim today