Teaching / supervision
News and recent activities
9 Aug 2021
My colleague Kasper Heintz was awarded 180 hours of observing time at the Very Large Telescope for studying "fast radio bursts". I explain what that means here.
12 Jul 2021
Albert Sneppen, student at DAWN, calculated something cool about black holes. I explain what here.
28 Jun 2021
Are you a teacher / disseminator, perhaps you'd be interested in this (free) Space Seminar at the Planetariet (where I'll be talking, among others).
28 May 2021
What is a "model galaxy? How do astronomers work? A slightly more complex popular science article on videnskab.dk than I usually write, but with animations!
11 May 2021
I'll be talking about the early Universe at Astronomy On Tap's public (and
) event in Copenhagen. You should come!
29 Apr 2021
Videnskabsklubben ("The Science Club") are broadcasting a science quiz for high-school students, and I'm co-quiz-mastering.
26–29 Apr 2021
This week is "The Danish Science Festival" where you can Book A Scientist — I'm participating with several public talks
6–11 Apr 2021
This week I'm hosting UCPH's new Twitter outreach channel,
, where UCPH researcher take turns on disseminating their science.
29 Mar 2021
What is a particle
? I try to answer this question from a reader.
28 Mar 2021
What keeps the Solar System in place in the Milky Way? I was interviewed about gravity by videnskab.dk's Christian Lindberg.
24–25 Feb 2021
Our CIDER workshop is going down today and tomorrow at 17:00–19:30 CET. Click here to follow our live-streaming on YouTube, or write me up to join.
21 Feb 2021
I've been doing some galaxy modeling and Lyman α radiative transfer resulting in a paper that has just been published (Noterdaeme et al. 2021).
18 Feb 2021
Everything in the Universe is built of little particles!
I participated in this "ABC of science" video from the Ministry of Education. With special effects!
29 Jan 2021
Does the Universe expand faster than the speed of light? Oh yes it does — read my answer in the Q&A column (Danish).
12 Jan 2021
I answered a question about the constellation Scorpius, and end up talking a bit about astrology (Danish).
30 Dec 2020
Apparently I'm now the "usual astrophysicist" of the Danish satire show Tæt På Sandhedens 😄 (starts at 5:00).
17 Dec 2020
My former colleague Mikkel discovered something cool about galaxy evolution. I wrote an article about it.
1 Dec 2020
The Arecibo telescope — the world's largest for over 50 years, and movie star of Contact and GoldenEye — has just collapsed. A saddening sight :(
24 Nov 2020
My article about galaxy formation has been translated to English.
23 Nov 2020
My article about galaxies has been translated to English.
17 Nov 2020
I've made a comic. It's called "Life of a comet is short".
12 Nov 2020
I'm allowed to chat for a full hour in this radio show, AND — and here's the best part — I get to choose the music! 😃
26 Oct 2020
Together with three other astronomers, I've organized a workshop on the Cold ISM (interstellar medium) During the Epoch of Reionisation (CIDER). Click here to join us!
10 Oct 2020
I'm the "Person of the Week" in the newspaper
, talking about black holes.
6 Oct 2020
The Nobel Prize in Physics 2020 went to astrophysics this year! Penrose, Gehz, and Genzel receive the Prize for their work on black holes, and I was interviewed about their contributions.
23 Sep 2020
How are galaxies formed? I wrote an article about galaxy formation with a step-by-step guide at videnskab.dk — a "sequel" to the article about galaxies from Sep 7.
23 Sep 2020
I dabble on about time & entropy i Radio 4 (at 36:08).
21 Sep 2020
I went to watch TENET with videnskab.dk's journalist Frederik Sonne, and we had a chat about time & entropy.
12 Sep 2020
How big a "rum ball" truffle cake can you make before it collapses? When does it start fusion? How happy will our Prime Minister be? See the answers in this interview.
7 Sep 2020
What is a galaxy, what are they made of, and what kinds are there? I wrote a popsci article about galaxies (in Danish).
31 Aug 2020
Today I was interviewed by the stand-up comedian Joanatan Spang, who wanted to know how big a "rum ball" truffle cake can be. Here are my calculations. The interview will be shown on television on Sep 12.
11 Jul 2020
Last night I saw the comet C/2020 F3 (NEOWISE), and captured a picture of it. Here's a guide if you want to see it too; it's very beautiful.
1–2 Jul 2020
I'm arranging a workshop for all DAWNers and DAWN-affiliates, and made this webpage.
22 Jun 2020
I co-authored a really cool paper, reporting on the detection of a group of galaxies emitting Lyα cooling radiation as they are forming.
15 Jun 2020
I'm no longer at the University of Oslo. From today, I'm at the Cosmic Dawn Center woohoo!
25 May 2020
I've been answering questions from a high school class on cosmology (in Danish though).
24 Apr 2020
The Hubble Telescope was launched 30 years ago today. Corona forced us to skip the planned public talk, and instead unbox this hitherto secret image.
3 Apr 2020
Tonight, Venus will pass in front of the Pleiades. Around 9 pm, they'll be in the West, and in Denmark the ISS will fly just below Orion at 9:03 pm.
23 Mar 2020
I wrote an article about supernovae for non-astronomers. Read it!
12 Mar 2020
Today I visited Tina Ibsen and Anders Høeg Nissen's podcast RumSnak to talk about the Big Bang. In Danish, though.
2–6 Mar 2020
I'm going to Paris to work with Pasquier Noterdaeme on damped Lyα absorbers (and give two talks).
13-16 Feb 2020
Sigurd, Rikke, and I are skiing for a few days in Oslo
22 Jan 2020
I'll be talking about Andromeda and other galaxies at the Cph. Planetarium, and if the sky is clear we'll try to observe it.
28 Dec 2019
I started updating my encyclopedia, and wrote a bit about black holes.
5 Dec 2019
Most stars are in fact two stars, orbiting each other at everything from one star radius to several light-years.
12 Nov 2019
Stars move in and out of a galaxy's spiral arms. I write about it here.
1 Nov 2019
Rapper and toastmaster Per Vers summerizes my research in a freestyle rap
1 Nov 2019
Copenhagen's Planetarium turns 30 years old. I'll be science slamming about my research in the evening.
25 Oct 2019
X-ray satellite scientist Selina Howalt Owe and I are starring in this advertisement for the Planetarium's birthday.
21 Oct 2019
Today I gave a seminar about cooling radiation and galaxy formation at UCL, London.
11 Oct 2019
I've co-authored this paper out today on the evolution of rest UV propoerties of galaxies out to z ~ 5.
5 Oct 2019
Tonight I was interviewed in Norwegian radio about the autumn night sky.
4 Oct 2019
Writing applications and cleaning up my rum collection…
(9 different rums which I rated between 1 and 8 stars)
23-24 Sep 2019
As a part of Science Festival 2019, I'm talking about cosmology at "Det Fri Gymnasium", and "Athene School for highly gifted children".
12 Sep 2019
I'll be guest-lecturing on (the history of) cosmology at UCPH's "
Cosmology (Astro 3)
29 Aug 2019
I created a webpage for a course I'm giving on "classic papers" in astrophysics & cosmology.
20 Aug 2019
A new planet has been discovered, 63 light-years away. I'm talking about it on the radio.
14 Aug 2019
So my colleague Matt Hayes reproduced a quasar spectrum by adjusting his running speed over a few kilometers.
12 Aug 2019
I've been identifying objects in a 300 years old drawing.
8 Aug 2019
Can galaxies recede faster than the speed of light? Oh yes they can!
26 Jul 2019
Um so yesterday, an asteroid almost wiped us out…
28 Jul 2019
During our vacation, we learned how to solve a Rubik's cube.
23 Jul 2019
My family and I have gone to Austria for vacation. It's very beautiful :)
20 Jul 2019
Today I was interviewed in Norwegian radio about stars and sand grains.
17 Jul 2019
My stepmom found that I've been quoted in the magazine Ude & Hjemme. This is basically one step below "Nature" 😂
17 Jul 2019
PSR B1919+21 has been re-observed — you may know the original observation from Joy Division's Unknown Pleasures.
12 Jul 2019
Can I accelerate a rocket with my mind? A question I've been wondering for a long time was solved after asking on Twitter and StackExchange.
11 Jul 2019
50 years ago today, Space Oddity was released.
9 Jul 2019
How fast is the fastest galaxy moving away? Three times the speed of light!
29 Jun 2019
I gave a "TED talk" about galaxies at my friend Cat's insane birthday party.
28 Jun 2019
How can we detect particles so small that they go right through Earth?
24 Jun 2019
Today's my birthday. I celebrated by giving a seminar on Lyα. My colleague Bo took this picture which he dubbed "Fit by arm".
13 Jun 2019
I'm in Stockholm at the "Zoom In & Out" workshop. My colleague Christian Herenz took this picture while I was giving a talk.
5 Jun 2019
The article about stars vs. grains of sand was translated to Norwegian on forskning.no.
2 Jun 2019
Are there more stars in the Universe than grains of sand on the beaches of Earth? I was interviewed to videnskab.dk.
29 May 2019
Today is the 100 years' anniversary for the Solar eclipse that consolidated Einstein's theory of general relativity. The paper is fun!
16 May 2019
How bright was the Universe after Big Bang? What's the color of the Universe? I calculate it here.
17 Apr 2019
How dark is a cosmic "void"? Pretty dark, according to my order-of-magnitude calculation here.
14 Apr 2019
I gave yet another interview about flat Earth conspiracists. Unfortunately, I'm quite misquoted. I'll contact the author at some point…
11 Apr 2019
What does the image of the black hole actually show? I explain it here.
10 Apr 2019
The rumors have been confirmed! We now have a real picture of a real black hole!
9 Apr 2019
My paper has been accepted yay!
4 Apr 2019
I'm starting up a new project. I want to calculate analytically the amount of cooling radiation emitted in Lyα when a galaxy forms.
29 Mar 2019
Some old Einstein letters have just been discovered in a basement outside Copenhagen.
21 Mar 2019
Okay so apparently, on average Mercury is closer to Earth than Venus, despite its orbit is closer to the Sun.
14 Mar 2019
Having some fun with numbers and galaxies.
17 Feb 2019
The article I wrote about the Big Bang has been translated to Norwegian on forskning.no.
1 Feb 2019
Did you know that on Mars, sunsets are blue? See here why.
9 Jan 2019
The Danish National Research Foundation reported my award. Now if they could just award me a grant it would be nice…
9 Jan 2019
Titan, the University of Oslo's newsletter, reported my award.
9 Jan 2019
Woohoo! My article from last year was awarded best Danish popular science 2018 😃
Naah, I'd rather not