Carl Sagan warned us
@carlsaganwarnedus.bsky.social
We were warned the darkness was coming.
Pinned
The Darkness has arrived, despite many brave attempts to prevent it.
We must use all our ingenuity, creativity, bravery, and most importantly - our humanity to fight back the darkness.
These must be our finest hours.
We must use all our ingenuity, creativity, bravery, and most importantly - our humanity to fight back the darkness.
These must be our finest hours.
Reposted by Carl Sagan warned us
Scientists may have detected dark matter.
YouTube video by Sabine Hossenfelder
youtu.be
December 1, 2025 at 2:02 PM
Reposted by Carl Sagan warned us
A (dark matter) Space Oddity:
We have an exciting new paper led by @pengfeili.bsky.social: arxiv.org/abs/2511.17705
He used the best data on the Milky Way rotation curve from Gaia to infer not the current, but the *primordial* dark-matter halo of the Galaxy.
And it is quite odd. 🧪🔭☄️
1/6
We have an exciting new paper led by @pengfeili.bsky.social: arxiv.org/abs/2511.17705
He used the best data on the Milky Way rotation curve from Gaia to infer not the current, but the *primordial* dark-matter halo of the Galaxy.
And it is quite odd. 🧪🔭☄️
1/6
The odd primordial halo of the Milky Way implied by Gaia. A shallow core, but a steep decline
Primordial dark matter halos are well understood from cold dark matter-only simulations. Since they can contract significantly as baryons settle into their centers, direct comparisons with observed ga...
arxiv.org
November 26, 2025 at 1:59 PM
A (dark matter) Space Oddity:
We have an exciting new paper led by @pengfeili.bsky.social: arxiv.org/abs/2511.17705
He used the best data on the Milky Way rotation curve from Gaia to infer not the current, but the *primordial* dark-matter halo of the Galaxy.
And it is quite odd. 🧪🔭☄️
1/6
We have an exciting new paper led by @pengfeili.bsky.social: arxiv.org/abs/2511.17705
He used the best data on the Milky Way rotation curve from Gaia to infer not the current, but the *primordial* dark-matter halo of the Galaxy.
And it is quite odd. 🧪🔭☄️
1/6
Reposted by Carl Sagan warned us
Reposted by Carl Sagan warned us
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...
Reposted by Carl Sagan warned us
Witkoff is not buying the Russian narrative. He is selling it.
November 26, 2025 at 5:24 PM
Witkoff is not buying the Russian narrative. He is selling it.
Reposted by Carl Sagan warned us
Interesting, though doesn't that model predict flat rotation curves, whereas the MW one is declining? So it might have issues explaining the outer, steep slope. This "Scalar/BEC soliton" in Fig. 1 looks interesting in that regard, but I'll have to read this in more detail.
November 26, 2025 at 4:44 PM
Interesting, though doesn't that model predict flat rotation curves, whereas the MW one is declining? So it might have issues explaining the outer, steep slope. This "Scalar/BEC soliton" in Fig. 1 looks interesting in that regard, but I'll have to read this in more detail.
Reposted by Carl Sagan warned us
UNESCO’s World Philosophy Day 2025 will initiate a dialogue on the ethics of inequality and the values shaping future societies with a talk by Prof. Ingrid Robeyns on “The Values of Societies of the Future.” @ingridrobeyns.bsky.social
#WorldPhilosophyDay2025
#WorldPhilosophyDay2025
World Philosophy Day 2025
UNESCO celebrates World Philosophy Day on 20 November in Paris with a keynote by Prof. Ingrid Robeyns on the ethics of inequality and values shaping future societies
buff.ly
November 20, 2025 at 2:15 PM
UNESCO’s World Philosophy Day 2025 will initiate a dialogue on the ethics of inequality and the values shaping future societies with a talk by Prof. Ingrid Robeyns on “The Values of Societies of the Future.” @ingridrobeyns.bsky.social
#WorldPhilosophyDay2025
#WorldPhilosophyDay2025
Reposted by Carl Sagan warned us
The CDC is making vaccine skepticism official. 😖
“On Thursday, the live version of the page stated: ‘The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.’”
🎁 article
“On Thursday, the live version of the page stated: ‘The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.’”
🎁 article
C.D.C. Changes Website to Reflect Kennedy’s Vaccine Skepticism
www.nytimes.com
November 20, 2025 at 2:46 PM
The CDC is making vaccine skepticism official. 😖
“On Thursday, the live version of the page stated: ‘The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.’”
🎁 article
“On Thursday, the live version of the page stated: ‘The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.’”
🎁 article
Reposted by Carl Sagan warned us
EPSTEIN BOMBSHELL: my staff is releasing a new report showing JPMorgan Chase executives – all the way to the top – enabled Epstein's sex trafficking operation. You're going to want to read this.
Wyden Presses for Investigation Into JPMorgan Chase and Epstein
www.nytimes.com
November 20, 2025 at 3:26 PM
EPSTEIN BOMBSHELL: my staff is releasing a new report showing JPMorgan Chase executives – all the way to the top – enabled Epstein's sex trafficking operation. You're going to want to read this.
Reposted by Carl Sagan warned us
This routine is amazing.
I remember when there was a discussion on Twitter about Shein's manufacturing practices and some apologists invented all sorts of fantastical machinery and technology to avoid facing the more horrifying truth. Reminds me of this comedian's joke.
IG bscomedian
IG bscomedian
November 20, 2025 at 12:13 AM
This routine is amazing.
Reposted by Carl Sagan warned us
Pretty obvious the past six months or so have been spent cleansing and/or deleting anything that might hurt the Orange Man.
November 19, 2025 at 7:34 PM
Pretty obvious the past six months or so have been spent cleansing and/or deleting anything that might hurt the Orange Man.
Reposted by Carl Sagan warned us
At least 30 individual or corporations who have given over $116M to Trump and his super PAC have received regulatory favors from the Trump White House.
That includes Big Tobacco companies, Pharma giants, and crypto moguls like the Winklevoss twins.
Pay-to-play corruption.
That includes Big Tobacco companies, Pharma giants, and crypto moguls like the Winklevoss twins.
Pay-to-play corruption.
November 19, 2025 at 7:31 PM
At least 30 individual or corporations who have given over $116M to Trump and his super PAC have received regulatory favors from the Trump White House.
That includes Big Tobacco companies, Pharma giants, and crypto moguls like the Winklevoss twins.
Pay-to-play corruption.
That includes Big Tobacco companies, Pharma giants, and crypto moguls like the Winklevoss twins.
Pay-to-play corruption.
Reposted by Carl Sagan warned us
🧪 I’ve been tracking this working paper since last month. This recent update is a big improvement (IMO) and seems to add an actual viable 3rd alternative to MOND & CDM theories while being completely consistent with GR.
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
The Quantum Vacuum Universe: Linear and Nonlinear Effects of Quantum Vacuum Composite Stiffness
We present the Quantum Vacuum Universe (QVU) as a unified physical framework in which gravity and cosmic expansion arise from the intrinsic stiffness of spacetime. The Quantum Vacuum Composite Stiffne...
doi.org
November 14, 2025 at 6:13 PM
🧪 I’ve been tracking this working paper since last month. This recent update is a big improvement (IMO) and seems to add an actual viable 3rd alternative to MOND & CDM theories while being completely consistent with GR.
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
Reposted by Carl Sagan warned us
If we don't rapidly phase out fossil fuels, we can say goodbye to coral reefs, the Greenland and Antarctic icesheets, and permafrost. The results will not be pretty.
3 massive changes you'll see as the climate careens toward tipping points
Scientists are increasingly concerned that the planet is headed for massive, irreversible changes due to global warming. In some cases, those changes have already begun.
www.npr.org
November 19, 2025 at 3:42 PM
If we don't rapidly phase out fossil fuels, we can say goodbye to coral reefs, the Greenland and Antarctic icesheets, and permafrost. The results will not be pretty.
Reposted by Carl Sagan warned us
Apropos of nothing in particular, two cosmology questions for my followers:
- in the first figure, are the black or blue contours in better agreement with the pink ones?
- in the second figure, are the black or blue contours in better agreement with (w0,wa)=(-1,0)?
🔭🧪☄️
- in the first figure, are the black or blue contours in better agreement with the pink ones?
- in the second figure, are the black or blue contours in better agreement with (w0,wa)=(-1,0)?
🔭🧪☄️
November 14, 2025 at 7:26 PM
Apropos of nothing in particular, two cosmology questions for my followers:
- in the first figure, are the black or blue contours in better agreement with the pink ones?
- in the second figure, are the black or blue contours in better agreement with (w0,wa)=(-1,0)?
🔭🧪☄️
- in the first figure, are the black or blue contours in better agreement with the pink ones?
- in the second figure, are the black or blue contours in better agreement with (w0,wa)=(-1,0)?
🔭🧪☄️
Reposted by Carl Sagan warned us
By studying the orbits of rare outer solar system objects, astronomers have estimated how long it took for the Sun to leave its birth cluster. aasnova.org/2025/11/14/t... 🔭🧪
The Sun Left Home in a Hurry
By studying the orbits of rare outer solar system objects, astronomers have estimated how long it took for the Sun to leave its birth cluster.
aasnova.org
November 14, 2025 at 5:40 PM
By studying the orbits of rare outer solar system objects, astronomers have estimated how long it took for the Sun to leave its birth cluster. aasnova.org/2025/11/14/t... 🔭🧪
🧪 I’ve been tracking this working paper since last month. This recent update is a big improvement (IMO) and seems to add an actual viable 3rd alternative to MOND & CDM theories while being completely consistent with GR.
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
The Quantum Vacuum Universe: Linear and Nonlinear Effects of Quantum Vacuum Composite Stiffness
We present the Quantum Vacuum Universe (QVU) as a unified physical framework in which gravity and cosmic expansion arise from the intrinsic stiffness of spacetime. The Quantum Vacuum Composite Stiffne...
doi.org
November 14, 2025 at 6:13 PM
🧪 I’ve been tracking this working paper since last month. This recent update is a big improvement (IMO) and seems to add an actual viable 3rd alternative to MOND & CDM theories while being completely consistent with GR.
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
@hossenfelder.bsky.social
@seanmcarroll.bsky.social
doi.org/10.33774/coe...
Reposted by Carl Sagan warned us
Not so sure the White House is going to be too happy with this ratio over at the other place
November 14, 2025 at 4:02 AM
Not so sure the White House is going to be too happy with this ratio over at the other place
Reposted by Carl Sagan warned us
On everything that matters, Trump has failed you.
November 13, 2025 at 7:00 PM
On everything that matters, Trump has failed you.
Reposted by Carl Sagan warned us
Reminder that Starbucks’ CEO made 6,666x more than the company's median employee in 2024.
This was the widest CEO-to-Worker pay gap in the entire S&P 500.
And we're supposed to believe Starbucks can't afford to bargain a fair contract with its unionized workers?
This was the widest CEO-to-Worker pay gap in the entire S&P 500.
And we're supposed to believe Starbucks can't afford to bargain a fair contract with its unionized workers?
As of this morning, Starbucks workers across the country are officially ON STRIKE. And we're prepared for this to become the biggest and longest ULP strike in Starbucks history.
Say #NoContractNoCoffee with us: DON'T BUY STARBUCKS for the duration of our open-ended ULP strike! $SBUX
Say #NoContractNoCoffee with us: DON'T BUY STARBUCKS for the duration of our open-ended ULP strike! $SBUX
November 13, 2025 at 4:30 PM
Reminder that Starbucks’ CEO made 6,666x more than the company's median employee in 2024.
This was the widest CEO-to-Worker pay gap in the entire S&P 500.
And we're supposed to believe Starbucks can't afford to bargain a fair contract with its unionized workers?
This was the widest CEO-to-Worker pay gap in the entire S&P 500.
And we're supposed to believe Starbucks can't afford to bargain a fair contract with its unionized workers?
Reposted by Carl Sagan warned us
The GOP has a huge pedophilia problem.
https://www.nytimes.com/2025/11/13/us/politics/in-matt-gaetz-scandal-circumstances-left-girl-vulnerable-to-exploitation.html?smid=url-share
https://www.nytimes.com/2025/11/13/us/politics/in-matt-gaetz-scandal-circumstances-left-girl-vulnerable-to-exploitation.html?smid=url-share
In Matt Gaetz Scandal, Circumstances Left Teen Vulnerable to Exploitation
www.nytimes.com
November 13, 2025 at 7:38 PM
The GOP has a huge pedophilia problem.
https://www.nytimes.com/2025/11/13/us/politics/in-matt-gaetz-scandal-circumstances-left-girl-vulnerable-to-exploitation.html?smid=url-share
https://www.nytimes.com/2025/11/13/us/politics/in-matt-gaetz-scandal-circumstances-left-girl-vulnerable-to-exploitation.html?smid=url-share
Reposted by Carl Sagan warned us
Circulating that new Epstein story and making it a thing is a smart political act given how conservatives feel about the situation
November 12, 2025 at 2:03 PM
Circulating that new Epstein story and making it a thing is a smart political act given how conservatives feel about the situation
Reposted by Carl Sagan warned us
Feedback loops and tipping points both worth bringing up but it’s all about the overall messaging. Two climate scientists I think are doing that messaging correctly are @michaelemann.bsky.social and @katharinehayhoe.com. They strike that balance of urgency with a call to action.
November 8, 2025 at 2:24 PM
Feedback loops and tipping points both worth bringing up but it’s all about the overall messaging. Two climate scientists I think are doing that messaging correctly are @michaelemann.bsky.social and @katharinehayhoe.com. They strike that balance of urgency with a call to action.
Reposted by Carl Sagan warned us
What do you get when you combine malignant narcissism with dementia? An existential threat.
Via @thetimes.com Radio: www.youtube.com/watch?v=9OtO...
Via @thetimes.com Radio: www.youtube.com/watch?v=9OtO...
‘The smoking gun’ that points to Trump’s cognitive decline | Psychologist analyses Trump
YouTube video by Times Radio
www.youtube.com
November 9, 2025 at 3:23 AM
What do you get when you combine malignant narcissism with dementia? An existential threat.
Via @thetimes.com Radio: www.youtube.com/watch?v=9OtO...
Via @thetimes.com Radio: www.youtube.com/watch?v=9OtO...
Reposted by Carl Sagan warned us
"Earth Matters: Check out the scary Emissions Gap Report; plus Michael E. Mann slams Bill Gates" by @meteorblades.bsky.social for @dailykos.com: www.dailykos.com/stories/2025...
Earth Matters: Check out the scary Emissions Gap Report; plus Michael E. Mann slams Bill Gates
For the past 16 years, the UN Environment Program has produced an annual Emissions Gap Report. This year’s edition shows a slight improvement in predictions from the 2024 report. However, even if ever...
www.dailykos.com
November 9, 2025 at 1:57 PM
"Earth Matters: Check out the scary Emissions Gap Report; plus Michael E. Mann slams Bill Gates" by @meteorblades.bsky.social for @dailykos.com: www.dailykos.com/stories/2025...