Oliver Hahn 🇪🇺
@cosmohahn.bsky.social
Computational Cosmologist, Simulator of Universes, Producer of NaNs, Prof
@univie.ac.at, opinions solely my own, (he/him), 334ppm
@univie.ac.at, opinions solely my own, (he/him), 334ppm
Reposted by Oliver Hahn 🇪🇺
Brightest-ever lensed supernova reveals astronomy’s coming revolution
Astronomers found our first gravitationally lensed superluminous supernova.
With the Vera C. Rubin Observatory now operational, hundreds, maybe thousands more should be coming.
bigthink.com/starts-with-...
#space #supernova
Astronomers found our first gravitationally lensed superluminous supernova.
With the Vera C. Rubin Observatory now operational, hundreds, maybe thousands more should be coming.
bigthink.com/starts-with-...
#space #supernova
Brightest-ever lensed supernova reveals astronomy's coming revolution
With the observation of SN 2025wny, a lensed superluminous supernova, astronomy's future comes into sharp, exciting focus.
bigthink.com
December 15, 2025 at 4:30 PM
Brightest-ever lensed supernova reveals astronomy’s coming revolution
Astronomers found our first gravitationally lensed superluminous supernova.
With the Vera C. Rubin Observatory now operational, hundreds, maybe thousands more should be coming.
bigthink.com/starts-with-...
#space #supernova
Astronomers found our first gravitationally lensed superluminous supernova.
With the Vera C. Rubin Observatory now operational, hundreds, maybe thousands more should be coming.
bigthink.com/starts-with-...
#space #supernova
It's as if there is a pattern...
Extreme attacks on #science documented here for just the first six months of the Trump regime. More data and information here:
www.ucs.org/resources/sc...
www.ucs.org/resources/sc...
December 10, 2025 at 7:08 PM
It's as if there is a pattern...
Reposted by Oliver Hahn 🇪🇺
The EPA has removed references about humans causing climate change from its website. No US government website can be trusted for science information.
December 10, 2025 at 4:06 PM
Reposted by Oliver Hahn 🇪🇺
Happy birthday to #mathematician & #computerscientist US Navy rear admiral Grace Hopper (1906-1992) who popularized the revolutionary idea of developing machine-independent programming languages based on English. 🧪🐡👩🏼🔬 #histsci
She began teaching at Vassar in 31 & got PhD (Yale) 🧵#artAdventCalendar
She began teaching at Vassar in 31 & got PhD (Yale) 🧵#artAdventCalendar
December 9, 2025 at 1:31 PM
Happy birthday to #mathematician & #computerscientist US Navy rear admiral Grace Hopper (1906-1992) who popularized the revolutionary idea of developing machine-independent programming languages based on English. 🧪🐡👩🏼🔬 #histsci
She began teaching at Vassar in 31 & got PhD (Yale) 🧵#artAdventCalendar
She began teaching at Vassar in 31 & got PhD (Yale) 🧵#artAdventCalendar
Reposted by Oliver Hahn 🇪🇺
Wow 98,000 peculiar velocities
The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue
by C.E. Ross and co-authors
arxiv.org/abs/2512.03226
For comparison: the Great Attractor was discovered with 400 PVs, Laniakea with 8000 PVs, South Pole Wall with 18,000 PVs
#Cosmicflows #Cosmology 🧪
The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue
by C.E. Ross and co-authors
arxiv.org/abs/2512.03226
For comparison: the Great Attractor was discovered with 400 PVs, Laniakea with 8000 PVs, South Pole Wall with 18,000 PVs
#Cosmicflows #Cosmology 🧪
December 8, 2025 at 2:26 PM
Wow 98,000 peculiar velocities
The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue
by C.E. Ross and co-authors
arxiv.org/abs/2512.03226
For comparison: the Great Attractor was discovered with 400 PVs, Laniakea with 8000 PVs, South Pole Wall with 18,000 PVs
#Cosmicflows #Cosmology 🧪
The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue
by C.E. Ross and co-authors
arxiv.org/abs/2512.03226
For comparison: the Great Attractor was discovered with 400 PVs, Laniakea with 8000 PVs, South Pole Wall with 18,000 PVs
#Cosmicflows #Cosmology 🧪
Reposted by Oliver Hahn 🇪🇺
A cartoon by Charles Barsotti, from 1994. Shop your favorite cartoons:
newyorkermag.visitlink.me/ZjVXum[…]id=...
newyorkermag.visitlink.me/ZjVXum[…]id=...
December 5, 2025 at 4:30 PM
A cartoon by Charles Barsotti, from 1994. Shop your favorite cartoons:
newyorkermag.visitlink.me/ZjVXum[…]id=...
newyorkermag.visitlink.me/ZjVXum[…]id=...
Reposted by Oliver Hahn 🇪🇺
Der #FWF fördert 3 neue #Spezialforschungsbereiche für mehr Grundlagenwissen in der Medizin, Quantenforschung und Kosmologie. Die neuen Netzwerke werden von Forscher:innen der @uniinnsbruck.bsky.social, der @unisalzburg.bsky.social und der @tuwien.at koordiniert. 📚
www.fwf.ac.at/aktuelles/de...
www.fwf.ac.at/aktuelles/de...
FWF bewilligt drei neue Spezialforschungsbereiche
Mehr Grundlagenforschung in der Medizin, der Quantenforschung und der Kosmologie – der FWF richtet zum Ausbau der Spitzenforschung in Österreich drei weitere Spezialforschungsbereiche ein.
www.fwf.ac.at
December 3, 2025 at 9:41 AM
Der #FWF fördert 3 neue #Spezialforschungsbereiche für mehr Grundlagenwissen in der Medizin, Quantenforschung und Kosmologie. Die neuen Netzwerke werden von Forscher:innen der @uniinnsbruck.bsky.social, der @unisalzburg.bsky.social und der @tuwien.at koordiniert. 📚
www.fwf.ac.at/aktuelles/de...
www.fwf.ac.at/aktuelles/de...
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
The new SFB "Dark UNiverse Explorations“ with participation of Oliver Hahn @cosmohahn.bsky.social and Sylvia Ploeckinger @univie.ac.at aims at shedding light on the dark universe by (dark energy and dark matter) - see 👉 fgga.univie.ac.at/en/dune/
December 3, 2025 at 11:10 AM
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
New Special Research Area "Dark Universe Explorations" with Prof. Oliver Hahn @cosmohahn.bsky.social!
The new FWF project aims to shed light on the Dark Universe 🌌
@univie.ac.at is represented by Prof. Hahn and Sylvia Ploeckinger (Department of Astrophysics).
More information and further reading:
The new FWF project aims to shed light on the Dark Universe 🌌
@univie.ac.at is represented by Prof. Hahn and Sylvia Ploeckinger (Department of Astrophysics).
More information and further reading:
mathematik.univie.ac.at
December 3, 2025 at 11:10 AM
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
Reposted by Oliver Hahn 🇪🇺
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?...
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
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?...
youtu.be/sQnOFGWsXNM?...
Reposted by Oliver Hahn 🇪🇺
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-...
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
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-...
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-...
Reposted by Oliver Hahn 🇪🇺
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
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…
Reposted by Oliver Hahn 🇪🇺
Still among my favorite science memes lol
November 29, 2025 at 7:15 PM
Still among my favorite science memes lol
Reposted by Oliver Hahn 🇪🇺
I didn’t know it was this bad at Goddard. Infuriating. 🧪
"They are throwing US science into the trash": www.npr.org/2025/11/12/n...
Goddard Space Center staff say they're 'constantly being attacked' by the White House
The Goddard Space Center is one NASA's crown jewels of science. But in recent months, staff say they've been in the White House's crosshairs, subjected to a campaign of chaos and reorganization.
www.npr.org
November 12, 2025 at 6:22 PM
I didn’t know it was this bad at Goddard. Infuriating. 🧪
Reposted by Oliver Hahn 🇪🇺
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...
(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
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...
(As a bonus, my demo actually worked, unlike in my 2021 Ri talk...!)
www.youtube.com/watch?v=bLa3...
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
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
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
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...
Reposted by Oliver Hahn 🇪🇺
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
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
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
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
Reposted by Oliver Hahn 🇪🇺
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
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
November 24, 2025 at 3:49 PM
Reposted by Oliver Hahn 🇪🇺
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/
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/
November 21, 2025 at 6:30 PM
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/
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/
Reposted by Oliver Hahn 🇪🇺
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
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...
Reposted by Oliver Hahn 🇪🇺
golden hour at the @univie.ac.at observatory
November 19, 2025 at 10:46 AM
golden hour at the @univie.ac.at observatory
Reposted by Oliver Hahn 🇪🇺
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
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
November 15, 2025 at 3:31 PM
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
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
Reposted by Oliver Hahn 🇪🇺
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
☑️ research note of the AAS doi.org/10.3847/2515-5172/ae1efc
☑️ ultra-high resolution version flic.kr/p/2rD6yGU
🧪 #Cosmology
November 15, 2025 at 1:03 PM
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
☑️ research note of the AAS doi.org/10.3847/2515-5172/ae1efc
☑️ ultra-high resolution version flic.kr/p/2rD6yGU
🧪 #Cosmology
Reposted by Oliver Hahn 🇪🇺
👀 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
👀 Physicists Take the Imaginary Numbers Out of Quantum Mechanics