Carl Haster
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haster.bsky.social
Carl Haster
@haster.bsky.social
630 followers 130 following 180 posts
Assistant Professor at UNLV+NevadaCfA looking for gravitational waves and the best music. Previously at LIGO, MITKavli, CITA_ICAT and UoBIGWaves.
Posts Replies Media Videos
haster.bsky.social
Nice and cool version of this song!
8-bit Boléro (The World's Most Ambitious Chiptune?)
YouTube video by lftkryo
youtu.be
December 22, 2025 at 9:33 AM
Reposted by Carl Haster
olthwaiteeric.bsky.social
Things are Terrible, but this isn't.

Be weird.
A social media post recounts a story about helping an older lady with limited English, reflecting on how having pink hair signaled trustworthiness and individuality.
December 19, 2025 at 11:02 PM
Reposted by Carl Haster
lindaholmes.bsky.social
More of this kind of rich person, please.
ricksteves.bsky.social Rick Steves @ricksteves.bsky.social · 9d
It’s the “season of love and giving”…but this year, doesn’t it seem more like a “season of fear and taking”? Like many of you, I’ve been saddened by the human impact of draconian government budget cuts and how angry many housed Americans are at unhoused Americans.

🧵 1 of 9
December 21, 2025 at 3:05 AM
Reposted by Carl Haster
alondra.bsky.social
🧵 NSF is reducing external review requirements and eliminating routine expert panels, citing staff shortages that this administration implemented. This change expands program officer authority. But the solution to flawed accountability isn't less public accountability.
December 16, 2025 at 12:33 AM
Reposted by Carl Haster
ackerfors.se
Återigen har @myrannosaurus.doomscroll.se skrivit dagens viktigaste text (om AI):

"Istället för att fokusera på lösningar för att peka ut vad som lurar människor behöver vi framtidssäkra för en befolkning som inte vågar tro på någonting alls. Som inte går att övertyga, ens med riktiga bevis." >
Nu räcker inte ögat längre
När AI får oss att inte lita på något längre, då utmanas demokratin.
www.etc.se
December 12, 2025 at 8:38 AM
Reposted by Carl Haster
wiswell.bsky.social
International conventions should not be held in the U.S.
newseye.bsky.social News Eye @newseye.bsky.social · 18d
NEW: Five years of social media history is only a fraction of what the US Government will shortly demand of overseas visitors.

The full requirements will end tourism in the United States.

Below is the full, mind-blowing list.

🚨THEY. WANT. YOUR. DNA.🚨

1/
- All social media accounts from the last 5 years - All your biometrics: face, fingerprint, DNA, and iris - All your phone numbers from the last 5 years - All your email addresses from the last 10 years - IP addresses and metadata from your submitted photos - Names of your family members (parents, spouse, siblings, children) - All your family members' phone numbers from the last 5 years - Your family members' dates of birth - Your family members' places of birth - Your family members' residencies - All your business phone numbers from the last 5 years - All your business email addresses from the last 10 years
December 11, 2025 at 10:49 PM
Reposted by Carl Haster
stsci.edu
Improvements ahead! A team at STScI recently launched a full suite of enhanced Jupyter Notebooks for scientific analyses with Hubble. The upgrades improve the functionality of the repository, as well as the DrizzlePac software suite: https://bit.ly/3XJAXVh 🔭 🧪 ☄️
Hubble Space Telescope in space orbiting above Earth’s limb. Words to the right read: Hubble Notebook Update.
December 9, 2025 at 6:14 PM
Reposted by Carl Haster
stevebrusatte.bsky.social
Heartbreaking. The University of Nebraska will terminate its entire Earth science department.

One of the country's most successful and respected geology & climate programs: gone.

When ideologues & politicians are threatened by the very act of studying climate change, I wonder: who of us is next?
celestelabedz.bsky.social Celeste Labedz @celestelabedz.bsky.social · 23d
It's over.

Despite the fact that the academic council recommended against it, despite the fact that the program brought in more tuition than it cost, and despite the fact that Nebraskans need & deserve this expertise, Earth & Atmospheric Sciences will be cut.

www.dailynebraskan.com/news/adminis...
BREAKING: ‘This hurts’: UNL eliminates 4 programs despite faculty, student pleas
The University of Nebraska-Lincoln eliminates the Earth and atmospheric sciences 8-0, educational administration 7-1, statistics 7-1, textiles, merchandising and fashion design 7-1 programs.
www.dailynebraskan.com
December 6, 2025 at 8:40 PM
Reposted by Carl Haster
astrojonny.bsky.social
It's easy to forget we live in a future with a fully operating space station with multiple docking ports for various spacecraft.

www.space.com/space-explor...
For the 1st time ever, 8 spacecraft are docked to the International Space Station
It's the first time all the spacecraft docking ports on the current configuration of the ISS have been occupied.
www.space.com
December 3, 2025 at 6:18 AM
Reposted by Carl Haster
kendrawcandraw.bsky.social
Happy old year
A black and white comic of the author talkin to themselves, they say “ahhh a new year, a fresh start”. They then look at the calendar in shock seeing it’s already May. “HUH? MAY??” they say. Then they say “that’s fine, I have the whole summer ahead of me!” They look at the calendar, now it’s September. “WHAT?! HUH?” They hold their head in their hands, despairing. “No, no, it’s okay, there’s still time” they look at the calendar which now says December and shriek “STOP!!” At it
December 1, 2025 at 10:15 PM
haster.bsky.social
A really nice Astrobites article about our recent discovery of two really interesting black hole binaries observed with @ligo.org and @egovirgo.bsky.social!
November 24, 2025 at 12:27 AM
Reposted by Carl Haster
urbanlandrent.bsky.social
Are you fucking kidding me it’s like we are living in a cartoon
Swatstika
November 21, 2025 at 8:33 AM
haster.bsky.social
Game for cool people
ccanonne.github.io Clément Canonne @ccanonne.github.io · Nov 21
In case you aren't already aware of one of the nerdiest, nich-est online games: TeXnique, where the goal is to type LaTeX formulae as quickly as possible. texnique.xyz

It is "fun."
An example, here asking to recreate in LaTeX the definition of a pseudorandom number generator
November 22, 2025 at 1:37 AM
Reposted by Carl Haster
astropy.org
Have you ever wanted @astropy.org tutorials on:
– spectroscopic data reduction from a raw FITS image,
– computing galactic orbits from Gaia measurements,
– cross-matching astronomical catalogs?

Check out the redesigned learn.astropy.org! Announcement from @numfocus.bsky.social below. 🧪🔭 #astrocode
Explore the Redesigned Learn.Astropy.org
A New Way to Learn Astronomy with Python
numfocus.medium.com
November 17, 2025 at 1:07 PM
Reposted by Carl Haster
ligo.org
We are pleased to announce our discovery of #GW241011 and #GW241110

Both come from binary black holes where one black hole is much larger than the other. The larger black holes have large spin. Could these black holes have formed in a previous merger?

ligo.org/science-summ...

#O4IsHere 🔭🧪⚛️☄️
Infographic about GW241011 and GW241110 GW241011's source contained black holes about 13 and 8 times the mass of our Sun. The spin of the bigger black hole is high and bear aligned with the orbit. GW241110's source contained black holes about 17 and 8 times the mass of our Sun. The spin of the larger black hole is high and near anti-aligned with the orbit. Credit: Shanika Galaudage/Northwestern University/Adler Planetarium
October 29, 2025 at 1:58 PM
Reposted by Carl Haster
mbkplus.bsky.social
A little less than a year ago, a large team of cosmologists reported evidence that dark energy (which drives the acceleration of the expansion of the Universe) evolves over time. This made a huge splash but has also been viewed with healthy skepticism. Today they report that evidence has weakened. 🧪
The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration
We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross...
arxiv.org
November 12, 2025 at 12:00 PM
Reposted by Carl Haster
ligo.org
Our next webinar will introduce our latest #GWTC4 release and the associated data (papers arxiv.org/abs/2508.18080 and arxiv.org/abs/2508.18079)

Tomorrow at 15:00 UTC, with the recording on YouTube after

Free registration wisconsin-edu.zoom.us/webinar/regi...

☄️🔭
GWTC-4.0 Introduction & Open Data Webinar 13 November 2025 Webinar live from 15:00 UTC
November 12, 2025 at 11:09 AM
Reposted by Carl Haster
unlv.edu
A universal mystery 🪐 Recently published research co-authored by UNLV astrophysicist Carl-Johan Haster gives insight into black holes and fundamental physics.

#UniversityResearch #Science #Physics #Astrophysics

www.unlv.edu/news/release...
Study: Pair of Distinct Black Hole Mergers Reveals Clues on How They Form and Evolve
The mergers, measured one month apart in 2024 by LIGO-Virgo-KAGRA collaboration, advance scientific understanding of the nature of black hole formation and fundamental physics; offer evidence of "seco...
www.unlv.edu
November 7, 2025 at 3:26 PM
Reposted by Carl Haster
ozgrav.bsky.social
We’re closer to solving dark matter thanks to these black holes!

OzGrav PhD student at ANU, Aswathi, was part of the analysis team of the GW241011+GW241110 special event paper. Here she explains how these events helped refine our understanding of dark matter.

youtube.com/shorts/wW4yp...
youtube.com
October 28, 2025 at 7:02 PM
haster.bsky.social
A really nice article in AAS Nova about our article that was published today!
aasnova.org AAS Nova @aasnova.org · Oct 28
Meet GW241011 and GW241101: with rapid spins and mismatched black hole masses, these gravitational wave events provide strong evidence for black hole growth through successive mergers. aasnova.org/2025/10/28/n... 🔭🧪 @ligo.org
Not Their First Rodeo: Gravitational Wave Detectors Spot Merging Black Holes That Have Merged Before
The gravitational wave events GW241011 and GW241110 provide strong evidence for the growth of black holes through successive mergers.
aasnova.org
October 28, 2025 at 6:14 PM
haster.bsky.social
I'm incredibly happy to share the amazing results we in the @ligo.org, @egovirgo.bsky.social, KAGRA collaborations have made public today.
iopscience.iop.org/article/10.3...

We are today announcing the observation of two new Binary Black Holes, GW241011 and GW241110.
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iopscience.iop.org
October 28, 2025 at 4:06 PM
Reposted by Carl Haster
ozgrav.bsky.social
Two #blackhole mergers, GW241011 & GW241110, detected a month apart in 2024 are helping scientists learn how black holes form, spin & evolve. Researchers from OzGrav & ANU, incl. PhD student Aswathi P Subhash & CI Dr Ling (Lilli) Sun contributed key analysis.
www.ozgrav.org/news/twin-bl...
Twin Black Hole Mergers Reveal Secrets of Cosmic Evolution - OzGrav
An international team of scientists from the LIGO, Virgo, and KAGRA collaborations, including researchers from the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), has detected two ...
www.ozgrav.org
October 28, 2025 at 3:13 PM
Reposted by Carl Haster
dieworkwear.bsky.social
this is the people's ballroom
The Last Vegas Sphere (a big round building) lights up with a smiling emoji
October 25, 2025 at 8:05 AM
haster.bsky.social
Stairway to heaven
#LIGOHanford
An outside staircase at the LIGO Hanford observatory, seemingly going up from the ground and ending into nothing
October 22, 2025 at 1:11 AM
Reposted by Carl Haster
cplberry.bsky.social
How it feels citing your old papers:

(Me et al. 2024b) = "per my last email"

(Me et al. 2019) = "told you so!"

(Me et al. 2009) = "as the prophesy foretold"
October 20, 2025 at 2:31 PM