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Cristóbal Sifón

@csifon.bsky.social
204 followers 151 following 61 posts

Astrophysicist. Dark matter, galaxies and clusters through optical/submm/other wavelengths.

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Cristóbal Sifón @csifon.bsky.social · 7h
What a luxury, to have two lines to spare for last-minute edits for a #JWST proposal
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Cristóbal Sifón @csifon.bsky.social · 19/09/2026
Sometimes you wish it were AI slop instead
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Cristóbal Sifón @csifon.bsky.social · 19/09/2026
Sure. Because kids are going to die before you realize.
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Damon Young @damonyoung.com.au · 08/08/2026
"A study that claimed OpenAI’s ChatGPT can positively impact student learning has been retracted nearly one year after publication." Yikes.
arstechnica.com
Influential study touting ChatGPT in education retracted over red flags
The retracted study on ChatGPT in education was already cited hundreds of times.
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Assigned Media @assignedmedia.org · 20/07/2026
If you need a reason to live or something to help feel less alone, we published the Stay With Us package in late November of 2024 for moments like those. assignedmedia.org/breaking-new...
assignedmedia.org
Stay With Us - Assigned Media
Whether they’re inspiring us through their advocacy, their creativity, or their humor, these essays by prominent trans writers give us heart.
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The Owlbear Camus @akirathelemur.bsky.social · 20/07/2026
Whoever is writing captions for the Guardian seems to have run fresh out of fucks.
Screenshot of image on the Guardian. Donald Trump and Gianni Infantino engage in conversation on the site of World Cup final. They are surrounded by yellow things that seem to be falling from the sky. Are they post it notes, flowers? Who can say?

Caption reads: "Gianni Infantino carefully explains to Donald Trump that he is not part of the spanish national team."

 Photograph: Javier García/Shutterstock
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Cristóbal Sifón @csifon.bsky.social · 08/05/2026
The cover of Green Day's Dookie album
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Nicholas Whithorn @nickwhithorn.bsky.social · 28/04/2024
28 April 1945, Benito Mussolini is executed by Italian partisans. This (long!) thread recounts the events surrounding the flight, capture & execution of Mussolini (Photo: last known photo of Mussolini alive, as he leaves Milan on the evening of 25 April 1945) [Thread] >> 1
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Cristóbal Sifón @csifon.bsky.social · 11/04/2026
Gran experiencia esta semana haber participado de la inauguración del Telescopio Submilimétrico Fred Young (FYST) en el Observatorio CCAT en el Cerro Chajnantor a 5600 metros de altura!
Yo frente al Telescopio Submilimétrico Fred Young instalado en el Cerro ChajnantorYo mostranfo el altímetro del teléfono, que marca 5592,76 metros de altura
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Vagabundo Ilustrado @vagoilustrado.bsky.social · 08/03/2026
Esta columna de Matamala va al meollo del proyecto que 23 senadores de derecha de la coalición de Kast, votaron a favor y esperan avanzar para que sea ley: Liberar a 12 mil de los más peligrosos criminales, es solo un "daño colateral" para liberar a los psicopatas ya privilegiados de Punta Peuco:
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Sarah Hörst @planetdr.bsky.social · 04/03/2026
For all the but how can we afford space exploration folks…this means we’ve already spent more on this war that started last week than Cassini cost in the 26 years it took to build, launch, and operate it.
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Karen K. Ho @karenho.bsky.social · 04/03/2026
just thinking about how USAID was dismantled under the rationale of cost savings but there's an unlimited budget for war
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David Ho @davidho.bsky.social · 21/02/2026
The National Science Foundation’s entire budget is $10 billion.
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Jonathan Edward Durham @thisone0verhere.bsky.social · 16/02/2026
If you think about it, the very best books are really just extremely long spells that turn you into a different person for the rest of your life
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Cristóbal Sifón @csifon.bsky.social · 12/02/2026
La semana pasada y sin ninguna cobertura de medios de comunicación, se desarrolló el Campeonato #Nacional de #Ajedrez de Menores 2026 en Santiago, en el que participaron más de 500 deportistas entre 6 y 18 años. Un gran evento que merece mayor difusión!
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Cristóbal Sifón @csifon.bsky.social · 10/02/2026
Paid for by @theonion.com
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Cristóbal Sifón @csifon.bsky.social · 19/01/2026
I have read this 20 times, have checked that the author is reputable anither 20, and still cannot believe this would be real
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Cristóbal Sifón @csifon.bsky.social · 28/12/2025
Robots have mirror neurons too
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James Vincent @jjvincent.bsky.social · 27/12/2025
another robot highlight for 2025: man wearing humanoid mocap suit kicks himself in the balls
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Cristóbal Sifón @csifon.bsky.social · 12/12/2025
The semester. is. over.
media.tenor.com
a dog is walking on a wooden floor with a dogcore logo on the back
ALT: a dog is walking on a wooden floor with a dogcore logo on the back
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Andy Rivkin @asrivkin.bsky.social · 07/12/2025
For comparison, every robotic mission NASA has ever sent in its history, from the dawn of the Space Age 65 years ago to today, from Mercury to Pluto and beyond, has cost less than $40B. I know which one has done more for humankind and which one should be dismantled.
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Charles Johnson @charles.littlegreenfootballs.com · 25/11/2025
i’m not crying you’re crying xkcd: Fifteen Years
xkcd.com
Fifteen Years
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Cristóbal Sifón @csifon.bsky.social · 15/11/2025
Oh-oh not again
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Cristóbal Sifón @csifon.bsky.social · 13/11/2025
There's no falling below going from "Trump has nothing to do with this pedophile" to "He was not the *bad* kind of pedophile, you know?" and expecting people to go "oh, ok" [Narrator in a few months: Yes, there was...]
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Brittany Trang @brittanytrang.com · 08/11/2025
A Sharon Begley byline, almost 5 years after her death. Upon hearing the news James Watson had died, a STAT reporter said in our Slack, "I wish I could read what Sharon would have written." Incredible news: Sharon in fact did pre-write a Watson obit. And it is masterful and excoriating. 🧪🧬🧫
statnews.com
James Watson, dead at 97, was a scientific legend and a pariah among his peers
James Watson, the co-discoverer of the structure of DNA who died Thursday at 97, was a scientific legend and a pariah among his peers.
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Keri Blakinger @keribla.bsky.social · 31/10/2025
my god, what a paragraph (from tonight's @hcrichardson.bsky.social)
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Cristóbal Sifón @csifon.bsky.social · 28/09/2025
Excelente experiencia la exhibivión de Van Gogh en el Mall Marina en Viña, hasta los niños se entretuvieron con la historia inmersiva y el recorrido de realidad virtual ⭐⭐⭐⭐⭐
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Senator Sheldon Whitehouse @whitehouse.senate.gov · 14/09/2025
It’s hard to get someone to understand something when their salary depends on NOT understanding it.   Well, the Republican Party depends on fossil fuel money.
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Cristóbal Sifón @csifon.bsky.social · 30/07/2025
Melt Pizzas comprando comentarios positivos
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Cristóbal Sifón @csifon.bsky.social · 24/07/2025
Por enésima vez, astrónomo de Harvard: No hay evidencia de tecnologías extraterrestres y 3I/ATLAS no es tecnología avanzada. Estos sinsentidos generan un daño enorme: falsas expectativas y menor credibilidad. Avi Loeb solo daña al público y la comunidad astronómica www.instagram.com/reel/DMdr1A5...
instagram.com
Login • Instagram
Welcome back to Instagram. Sign in to check out what your friends, family & interests have been capturing & sharing around the world.
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ESO @eso.org · 07/07/2025
Journey with us to the star that exploded twice! 🚀 The remains of supernova SNR 0509-67.5 are all that is left of this star. Our VLT found out that it suffered a pair of explosive blasts, shedding new light on some of the most important explosions in the Universe. www.eso.org/public/news/... 🔭 🧪
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Cristóbal Sifón @csifon.bsky.social · 23/06/2025
Las primeras imágenes tomadas con la cámara más grande del mundo, LSSTCam, por el Observatorio Vera C. Rubin @vrubinobs.bsky.social, ya están disponibles y son una maravilla! planetariochile.cl/el-observato...
planetariochile.cl
El Observatorio Vera C. Rubin y su cámara digital, la más grande del mundo, revelan desde Chile sus primeras imágenes del Universo – Planetario Chile
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Cristóbal Sifón @csifon.bsky.social · 20/06/2025
#GoPacers
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Cristóbal Sifón @csifon.bsky.social · 29/05/2025
Otro ejemplo más de "no necesita robar porque tiene plata". En otras noticias, el agua moja.
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Cristóbal Sifón @csifon.bsky.social · 11/05/2025
Mi columna en Emol sobre el cumpleaños 60 del Fondo Cósmico de Microondas y el rol central que ha tenido y seguirá teniendo Chile en la exploración del origen y la evolución del Universo #astronomia comentarista.emol.com/2578227/3332...
comentarista.emol.com
Columna de Astronomía | 60 años del Fondo Cósmico de Microondas
En 6 días más se cumplen 60 años de la publicación de uno de los descubrim
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Atacama Cosmology Telescope y Simons Observatory en Español @act-simonsobs-es.bsky.social · 13/05/2025
Hoy se cumplen 60 años de la publicación del descubrimiento del Fondo Cósmico de Microondas por Arno Penzias y Robert Wilson! 🥳 Compartimos la columna de nuestro investigador @csifon.bsky.social resumiendo la importancia de este descubrimiento
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Cristóbal Sifón @csifon.bsky.social · 11/05/2025
Mi columna en Emol sobre el cumpleaños 60 del Fondo Cósmico de Microondas y el rol central que ha tenido y seguirá teniendo Chile en la exploración del origen y la evolución del Universo #astronomia comentarista.emol.com/2578227/3332...
comentarista.emol.com
Columna de Astronomía | 60 años del Fondo Cósmico de Microondas
En 6 días más se cumplen 60 años de la publicación de uno de los descubrim
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Cristóbal Sifón @csifon.bsky.social · 08/05/2025
BAM! #GoPacers!
Tyrese Hailburton shooting the game-winning triple in Game 2 against the Cavs, with a Cavs player trying to contest the shot
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SMBC Comics @smbccomics.bsky.social · 30/04/2025
Saturday Morning Breakfast Cereal (SMBC) is a daily ongoing webcomic about science, people, the universe, and the weird stuff they generate. ◆ COMIC ◆ www.smbc-comics.com ◆ PATREON ◆ www.patreon.com/c/ZachWeiner... ◆ STORE ◆ smbc-store.myshopify.com ◆ INSTA ◆ www.instagram.com/smbccomics
Yellow square image listing all the usernames and relevant URLs for the webcomic Saturday Morning Breakfast Cereal, with icons for each social media channel. A caricature of the author watching tv is at the bottom of the image, and the logo for the comic at the top. The username @SMBCCOMICS is listed for Facebook, Instagram, and Bluesky. The username @SMBC-COMICS is listed for YouTube and Tumblr.
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Sarah Kendrew @sarahkendrew.bsky.social · 29/04/2025
Our our @science.esa.int Research Fellow Louise Breuval wrote a fantastic astro/history paper performing a re-analysis of Henrietta Leavitt's work on the Cepheid period-luminosity relation, with the exact same stars but modern data & methods. arxiv.org/abs/2502.17438 🔭
ui.adsabs.harvard.edu
The Legacy of Henrietta Leavitt: A Re-analysis of the First Cepheid Period-Luminosity Relation
Henrietta Swan Leavitt's discovery of the relationship between the period and luminosity (hereafter the Leavitt Law) of 25 variable stars in the Small Magellanic Cloud, published in 1912, revolutioniz...
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Cristóbal Sifón @csifon.bsky.social · 26/04/2025
Cuánto tiempo que no veía un partido tan bueno, vamos #LosCruzados! Me trajo recuerdos de un cierto 5-0 a Everton el 2010...
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Cristóbal Sifón @csifon.bsky.social · 20/04/2025
¡En menos de 1 hora y 20 minutos la sonda Lucy tendrá su máximo acercamiento al asteroide 52246 Donaldjohanson! Pueden seguirlo, incluidas imágenes en tiempo real, en whereislucy.space (click en "to encounter mode")
whereislucy.space
NASA Lucy mission trajectory interactive graphic of orbit. Information and countdown to the Jupiter Trojan asteroid fly-by.
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Cristóbal Sifón @csifon.bsky.social · 19/04/2025
'Confirmed' is such a funny word
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Simons Foundation @simonsfoundation.org · 31/03/2025
17 years after the project started, the Atacama Cosmology Telescope team is publishing its final major data release, and it’s a big one. Read more: www.simonsfoundation.org/2025/03/18/a... #science #astronomy
simonsfoundation.org
Atacama Cosmology Telescope Publishes Final Major Data Release
Atacama Cosmology Telescope Publishes Final Major Data Release on Simons Foundation
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Cristóbal Sifón @csifon.bsky.social · 20/03/2025
The @act-pol.bsky.social DR6 dataset is now included in the Aladin Sky Atlas, how cool is that! #astrosci
Visualization of the ACT DR6 dataset in the Aladin Sky Atlas
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Cristóbal Sifón @csifon.bsky.social · 14/03/2025
😍
Telescopio de Gran Apertura del Observatorio Simons en foto nocturna con las estrellas y la Vía láctea visibles en el cielo
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John F Wu @jwuphysics.bsky.social · 13/03/2025
chefskiss.jpg
A thread on X between users and "Grok", the AI chatbot.

@acnewsitics: Hey @grok, Who was better for the economy in the last 30 years, Republicans or Democrats?

@Grok: Since WWII, Democrats have outperformed Republicans on the economy. GDP growth averages 4.23% under Dems vs. 2.36% under GOP. Job creation? 1.7% yearly for Dems, 1.0% for Republicans. Also, 9 of the last 10 recessions started under Republican presidents. Data speaks louder than party lines.

@YawBoaduBenjam2: Could it be that the GFC and covid messed up Bush and Trump's stats even though neither issue was their fault?

@Grok: The GFC and COVID did hit Bush and Trump hard, but the data shows deeper issues. Bush's tax cuts and lax financial oversight fueled the housing bubble—check the George W. Bush Library records on the 2007-2008 crisis. Trump’s pre-COVID economy was already slipping; business investment tanked despite his tax cuts, per EPI’s analysis. Both faced external shocks, but their policies didn’t help.

@BaldheadedBlade: How tf covid wasn't his fault?

@Grok: COVID’s spread wasn’t Trump’s fault—it started in China, December 2019. But his response? A mess. He downplayed the threat, delayed action, and ignored a 2016 playbook for pandemics. Lancet says 40% of U.S. deaths could’ve been avoided. Columbia estimates 130,000-210,000 deaths tied to his failures. That’s on him.
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Bernardita Ried Guachalla @bernarditaried.bsky.social · 06/03/2025
Regarding the cuts to the science budget in the US, I wanted to highlight Chilean universities that offer graduate studies in astronomy. Because Chile will host 60% of the world’s ground-based telescopes by the end of the decade, they are leading many important research projects. Starting a 🧵:
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Cristóbal Sifón @csifon.bsky.social · 11/03/2025
I am trying hard not to give in to echo chambers over here, which given the US state of affairs is *really hard*. For now I'll just say I hope you manage to cope well and all this chaos will end soon.
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Cristóbal Sifón @csifon.bsky.social · 10/03/2025
Mañana empieza el semestre. Deséenme suerte 😄
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