Oliver Hahn 🇪🇺
LightNews LightNews
banner
cosmohahn.bsky.social
Oliver Hahn 🇪🇺
@cosmohahn.bsky.social
150 followers 110 following 59 posts
Computational Cosmologist, Simulator of Universes, Producer of NaNs, Prof
@univie.ac.at, opinions solely my own, (he/him), 334ppm
Posts Replies Media Videos
Reposted by Oliver Hahn 🇪🇺
astrokatie.com
I haven’t seen this label used before but it seems apt. The video contains a good discussion of what “science populism” is and how it’s harmful.

youtu.be/sQnOFGWsXNM?...
Ep 0: The Rise of the Science Populists
YouTube video by Bad Boy of Science
youtu.be
December 3, 2025 at 3:02 AM
Reposted by Oliver Hahn 🇪🇺
pomarede.bsky.social
LiteBIRD Mission Takes One Step Forward

The next-generation cosmic microwave background (CMB) polarization satellite has been approved to move forward, following a review held at JAXA's Institute of Space and Astronautical Science. #LiteBIRD 🧪 #Cosmology

www.ipmu.jp/en/20251201-...
LiteBIRD Mission Takes One Step Forward
December 1, 2025 The University of Tokyo Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI)
www.ipmu.jp
December 1, 2025 at 8:55 AM
Reposted by Oliver Hahn 🇪🇺
kattascha.bsky.social
Der Beschluss des Grünen-Parteitags gegen eine Erstattung von Homöopathie durch gesetzliche Krankenkassen ist ein wichtiges Signal. Es geht nicht (nur) ums Geld. Es geht auch um Abgrenzung: Was durch die Solidargemeinschaft finanziert wird, muss wissenschaftlich belegt sein. Die Erstattung führt…
November 29, 2025 at 5:19 PM
Reposted by Oliver Hahn 🇪🇺
matthematics.com
Still among my favorite science memes lol
Two red spinning balls are shown, one labeled +1/2 and its spin oriented positively and another labeled -1/2 and oriented negatively. Caption: "Electron spin explained: imagine a ball that's rotating, except it's not a ball and it's not rotating"
November 29, 2025 at 7:15 PM
Reposted by Oliver Hahn 🇪🇺
leilabelkora.bsky.social
I didn’t know it was this bad at Goddard. Infuriating. 🧪
November 12, 2025 at 6:22 PM
Reposted by Oliver Hahn 🇪🇺
mattbothwell.com
It was a huge pleasure to be back at the Royal Institution last month! I gave a lecture all about the mysteries of dark matter, which is now up on YouTube. 🧪🔭

(As a bonus, my demo actually worked, unlike in my 2021 Ri talk...!)

www.youtube.com/watch?v=bLa3...
The quest for dark matter with Matt Bothwell
YouTube video by The Royal Institution
www.youtube.com
November 26, 2025 at 4:34 PM
cosmohahn.bsky.social
Speaking out for science ... My subjective conclusions to a short talk on "From Einstein to Astrology: 
On Misquotes, Scepticism, and Speaking Out for Science" at the VISESS doctoral school in Vienna
November 26, 2025 at 10:42 PM
cosmohahn.bsky.social
Enjoyed giving a short talk "From Einstein to Astrology: 
On Misquotes, Scepticism, and Speaking Out for Science" at the #VISESS doctoral school, remembering our open letter to Austrian public TV ultimately cancelling an astrology show. A small victory given the constant attacks on science...
November 26, 2025 at 9:25 PM
Reposted by Oliver Hahn 🇪🇺
startswithabang.bsky.social
How far back in time can the naked eye see?

To see back in the Universe farther than ever before, we need large, powerful telescopes.

But the naked eye, if you look just right, can take you impressively far.

bigthink.com/starts-with-...

#space #astro #cosmology
How far back in time can the naked eye see?
Every observation out into deep space is also a look back in time.
bigthink.com
November 24, 2025 at 4:40 PM
Reposted by Oliver Hahn 🇪🇺
drnereide.bsky.social
24 November 1859: 'On the Origin of Species', Charles Darwin's groundbreaking book, was published.

Darwin's magnum opus is considered to be the foundation of evolutionary biology and is undoubtedly one among the most important books in the history of science.

🧪 #science #histsci #Darwin

1/3
The 1859 cover of the 'On the Origin of Species' Public domain Via: https://commons.wikimedia.org/wiki/File:Origin_of_Species.jpg
November 24, 2025 at 3:49 PM
Reposted by Oliver Hahn 🇪🇺
coreyspowell.bsky.social
One of the most exciting discoveries from JWST is "Little Red Dots": ultra-distant galaxies rapidly forming new stars & spawning a giant black hole

They tell us that galaxies grew up a lot faster than we thought. We don't know how--but new observations offer clues. 🧪🔭

esawebb.org/news/weic2522/
This image shows the location of galaxy CANUCS-LRD-z8.6 in galaxy cluster MACS J1149.5+2223, as seen by Webb’s Near-Infrared Camera (NIRCam). CANUCS-LRD-z8.6 is part of a class of small, very distant and strikingly red galaxies called Little Red Dots (LRDs), which have been spotted in increasing numbers by Webb’s surveys of the early Universe. It is located in the constellation Leo (the Lion), and is seen by Webb just 570 million years after the Big Bang.
November 21, 2025 at 6:30 PM
Reposted by Oliver Hahn 🇪🇺
elsa-euclid.bsky.social
Beautiful comparison of @ec-euclid.bsky.social's infrared view of an interstellar dark cloud, compared to what we see in optical light 🧪🔭 www.youtube.com/watch?v=MlmQ...
Infrared vs Optical: Euclid reveals what lies within and behind the Dark Cloud
YouTube video by Euclid Consortium
www.youtube.com
November 20, 2025 at 4:20 PM
Reposted by Oliver Hahn 🇪🇺
emily.space
golden hour at the @univie.ac.at observatory
A photo of the observatory entrance. The building is gold from the sun Looking towards the observatory's dome
November 19, 2025 at 10:46 AM
Reposted by Oliver Hahn 🇪🇺
michaelemann.bsky.social
La Nina is here and the global cool-down is well underway (global mean sea surface temps are lowest since March 2023).
Remember it's not the individual ups & downs that matter, it's the steady warming trend, which will continue until we reach zero carbon emissions.
#Urgency #StayFocused #COP30
source: https://pulse.climate.copernicus.eu/ source: https://pulse.climate.copernicus.eu/
November 15, 2025 at 3:31 PM
Reposted by Oliver Hahn 🇪🇺
pomarede.bsky.social
A Revised Three-dimensional Visualization of the Local Group of Galaxies, by Antonio Ciccolella

☑️ research note of the AAS doi.org/10.3847/2515-5172/ae1efc
☑️ ultra-high resolution version flic.kr/p/2rD6yGU

🧪 #Cosmology
The Milky Way and its satellite dwarf galaxies. A wider view of the Milky Way and its satellite dwarf galaxies. The Andromeda galaxy and its satellite dwarf galaxies. The full visualization of the Local Group.
November 15, 2025 at 1:03 PM
Reposted by Oliver Hahn 🇪🇺
nbody6.bsky.social
👀 Physicists Take the Imaginary Numbers Out of Quantum Mechanics
Physicists Take the Imaginary Numbers Out of Quantum Mechanics | Quanta Magazine
Quantum mechanics has at last been formulated exclusively with real numbers, bringing a mathematical puzzle at the heart of the theory into a new era of inquiry.
www.quantamagazine.org
November 8, 2025 at 9:31 PM
cosmohahn.bsky.social
dhaka brakha. such amazing music! it breaks my heart that Ukraine is still not at peace... www.youtube.com/watch?v=H7cp...
DakhaBrakha - Khyma (Live on KEXP)
YouTube video by KEXP
www.youtube.com
November 7, 2025 at 9:04 PM
Reposted by Oliver Hahn 🇪🇺
pomarede.bsky.social
in the #arXiv

The SPHEREx Satellite Mission

by James Bock and co-authors
arxiv.org/abs/2511.02985 #SPHEREx #Cosmology 🧪
This is Figure 6 of the paper with caption reading: Diagram of the SPHEREx observatory, showing (from top to bottom) the three conical photon shields with a cutaway view, the telescope, radiator panel for the mid-wave infrared (MWIR) detectors, the MWIR and short-wave infrared (SWIR) focal plane arrays (FPAs), and the 3-stage V-groove radiator assembly with penetrating bipods for supporting the telescope assembly. The BAE spacecraft at the bottom provides pointing, power, and telemetry and houses the instrument readout electronics.
November 6, 2025 at 10:57 AM
Reposted by Oliver Hahn 🇪🇺
pomarede.bsky.social
in the #arXiv

Revealing Hidden Cosmic Flows through the Zone of Avoidance with Deep Learning

by Alexandra Dupuy and co-authors
arxiv.org/abs/2511.03919 🧪 #Cosmology
3D visualization of the mean density and peculiar velocity fields in supergalactic coordinates. The isosurfaces represent the mean density field across 1,000 realizations, with three levels highlighting different density thresholds. Streamlines depict the mean peculiar velocity field, also averaged over 1,000 realizations. Tiny purple spheres mark the positions of Great Attractor (GA) candidates. Tiny grey spheres indicate the positions of streamline endpoints that were not identified as GA, where the streamlines terminated at the box limits. The orientation and scale of the visualization are shown by the SGX, SGY, and SGZ axes, represented by red, green, and blue arrows at the observer’s position (the cube center), each with a length of 10 Mpc/h.
November 7, 2025 at 10:01 AM
Reposted by Oliver Hahn 🇪🇺
drnereide.bsky.social
On 7 November 1878, physicist Lise Meitner was born.

Read Baez’s thread: a real jewel of science storytelling and passion.

Lise Meitner also kicked the door wide open for women in physics with nothing but genius and grit.

Read it, fall in love, share it.

⚛️ 🧪 #physics #HistSci #WomenInSTEM
johncarlosbaez.bsky.social John C. Baez @johncarlosbaez.bsky.social · 28d
Lise Meitner, who discovered nuclear fission and did the experiments that led Pauli to postulate neutrinos, is one of my heroes. She had to work twice as hard for everything, and did so much.

I tell a bit of her story here:

mathstodon.xyz/@johncarlosb...
John Carlos Baez (@[email protected])
Attached: 1 image Lise Meitner, who discovered nuclear fission, is one of my heroes. She had to work twice as hard for everything, and did so much. The Austrian government did not open the universi...
mathstodon.xyz
November 7, 2025 at 10:16 AM
cosmohahn.bsky.social
Amazing! The beginnings of large-scale structure cosmology not even 100 years ago... Today we're reaching per-cent level accuracy.
pomarede.bsky.social Daniel Pomarède @pomarede.bsky.social · 27d
Cosmography archives

The Distribution of Extra-Galactic Nebulae

by Edwin Hubble (1934)

ui.adsabs.harvard.edu/abs/1934ApJ....

#Cosmology 🧪
An all sky map displaying the distribution of galaxies in the galactic coordinate system, in the Aitoff projection. Small dots represent survey fields with normal distribution; large disks and circles represent fields with excesses and deficiencies, with crosses added for larger ones. Dashes represent fields with no galaxies.
November 5, 2025 at 8:18 PM
Reposted by Oliver Hahn 🇪🇺
chhdellago.bsky.social
Join us on Friday, 7 Nov, 14-18, for the ESI Medal Symposium in honor of Michele Parrinello, at @esivienna.bsky.social or online. Talks by G. Kresse, @mahrossi.bsky.social, G. Foffi, and M.Parrinello and even some music! 🎶 Should be an interesting afternoon.

www.esi.ac.at/events/e593/
November 4, 2025 at 5:29 PM
Reposted by Oliver Hahn 🇪🇺
lswisnom.bsky.social
Academics in Assyria in the 7th c BC complain that admin is preventing them from doing research and teaching
November 3, 2025 at 10:04 AM
Reposted by Oliver Hahn 🇪🇺
carlbergstrom.com
Another casualty of the LLM revolution.

In "arXiv’s CS category, review articles and position papers must now be accepted at a journal or a conference and complete successful peer review."
Attention Authors: Updated Practice for Review Articles and Position Papers in arXiv CS Category – arXiv blog
blog.arxiv.org
November 2, 2025 at 4:58 AM
Reposted by Oliver Hahn 🇪🇺
astrokat.bsky.social
Are you a grad student interested in writing for Astrobites, or do you know one? We're recruiting! Apply by November 26 :)

astrobites.org/2025/10/31/a...
Apply to Write for Astrobites 2025!
Love astronomy, astrophysics, and science communication? Come join the Astrobites team! Applications due November 26th.
astrobites.org
October 31, 2025 at 6:40 PM