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Sarah Hörst

@planetdr.bsky.social

Professor of planetary science at Johns Hopkins. Titan’s biggest fan. Pomeranian wrangler. Runner. Love many, trust few, always paddle your own canoe. She/her. sarahhorst.com Planetdr.26 on signal

25,030 Followers  |  502 Following  |  6,646 Posts  |  Joined: 28.04.2023  |  1.9111

Latest posts by planetdr.bsky.social on Bluesky

Every Thursday for over 30 years (including through the icy Montana winters) my dad drove 2-3 hours each way to hold clinics in different towns so that his patients didn’t always have to come to him. In 1988 they hit a patch of black ice and he and his nurse ended up upside down in a ditch. Fuck AI

02.02.2026 20:41 — 👍 1    🔁 0    💬 1    📌 0

Professional athletes are being advised not to leave the hotel or go anywhere without their passports while visiting Minnesota.

This is not a country that can safely host international events like the World Cup.

Boycotting is not even a political question anymore. It is a basic issue of safety.

02.02.2026 18:15 — 👍 1668    🔁 622    💬 18    📌 18

CNN is reporting the real reason Trump is closing the Kennedy Centre for two years is not for renovation: “the Kennedy Center does not have a 2026/2027 season. There would not have been any programming to announce."

02.02.2026 19:45 — 👍 2401    🔁 732    💬 109    📌 122
Preview
Inside Musk’s bet to hook users that turned Grok into a porn generator Under pressure to boost its popularity, Elon Musk’s xAI loosened guardrails and relaxed controls on sexual content, setting off internal concern.

NEW: Inside Elon Musk's push to hook Grok users by leaning into NSFW content. Workers were told they'd be working with sexual material, were advised to gauge job candidates' comfort with doing so. Soon they were training Grok on lewd conversations & depictions of sexual violence
wapo.st/45DcMMI

02.02.2026 18:21 — 👍 32    🔁 21    💬 3    📌 1

Columbia Heights (Liam's school district) cancelled school today because of a credible bomb threat at Liam's elementary and multiple ICE vehicles parking in the high school staff parking lot at 6:15am.

02.02.2026 12:59 — 👍 1657    🔁 543    💬 27    📌 89

Ok here is a list of all the anti-ICE indie nail polishes that I know of, so far.
Disclaimer: I haven't tried any of them* so idk how they are in practice, and this is not a thread of reviews

02.02.2026 02:21 — 👍 77    🔁 37    💬 3    📌 1

Ayup

02.02.2026 01:50 — 👍 1    🔁 0    💬 0    📌 0

If the infographic I saw on IG the other day was correct they are illegal in Maryland 🤷‍♀️

01.02.2026 21:17 — 👍 1    🔁 0    💬 1    📌 0

We went to Lowe’s yesterday. They were out of pickaxes in case you were wondering how the snowcrete is going

01.02.2026 21:15 — 👍 61    🔁 7    💬 7    📌 2
Preview
Donate Your Skymiles — Stand With Minnesota Donate your Delta Skymiles to get people home from Texas

Okay! This has already inspired a bunch of DMs, so I made a page on the website. If you have 50,000+ Skymiles and would be willing to book flights to get someone home, please fill this out.

01.02.2026 18:22 — 👍 995    🔁 755    💬 20    📌 38

Many of the vaccines are required as a matter of state law. He does not have this authority (yet). Unfortunately, proposed legislation would weaken exemption requirements.

01.02.2026 19:00 — 👍 49    🔁 17    💬 1    📌 2

I have done an absolutely ridiculous amount of work outside of my normal working hours this past week for various reasons and I feel like I’m going to be starting the week with my tired/grumpy pants on.

Ok back to work.

01.02.2026 19:58 — 👍 31    🔁 0    💬 2    📌 0
Preview
Five-year-old deported to Honduras despite being US citizen is latest child victim of Trump crackdown Mother whose visa application was pending says she will send girl back to US soon accompanied by another relative

A judge ordered that 5 year old Liam Ramos be released from ICE custody.

I hope they let him out.

I hope they give him his back pack and bunny hat.

But let’s not forget they sent a 5 year old girl to Honduras without due process.

She’s a US citizen and they disappeared her.

01.02.2026 09:28 — 👍 228    🔁 103    💬 5    📌 2
Preview
Democrat Taylor Rehmet wins a reliably Republican Texas state Senate seat, stunning GOP Democrat Taylor Rehmet won a special election for the Texas state Senate and flipped a reliably Republican district that President Donald Trump won by 17 points in 2024.

As we say in @thecomedyresistance.com:

JUST FUCKING VOTE!

apnews.com/article/texa...

01.02.2026 06:39 — 👍 62    🔁 6    💬 1    📌 0

If your children got tear gassed today I want to hear from you, even if you don’t live in my district. You can contact my office at councilor.green@portlandoregon.gov

01.02.2026 06:06 — 👍 1539    🔁 695    💬 17    📌 25
Preview
Rep. Joe Neguse urges residents to send comments to NSF in support of NCAR U.S. Rep. Joe Neguse, a Lafayette Democrat, is urging all Boulder and Colorado residents to submit written comments to the National Science Foundation in support of the National Center for Atmosphe…

Our fight against Trump’s reckless threat to dismantle NCAR continues, and we are building a bipartisan coalition to stop it.

I urge all Coloradans to make their voices heard during the NSF's public comment period.

See the Daily Camera’s reporting 👇🏽

28.01.2026 17:44 — 👍 141    🔁 65    💬 6    📌 1
Preview
ICE Is Circling Minnesota Schools, Looking For Children to Take Liam Ramos, 5, isn’t the only child in detention. Teachers and parents describe kids being hunted by federal agents.

NEW: School hallways are silent. Grandparents patrol outside in shifts. Two more kids taken from Liam Ramos' school.

Trump isn't deescalating ICE at all at MN schools.

“I stopped wearing my high heels to work. I wear my boots to work because I have had to run." www.huffpost.com/entry/ice-mi...

31.01.2026 13:32 — 👍 3990    🔁 2182    💬 62    📌 120

Reminder about signal, devices with touch/face id etc.

Passcode/password everything

01.02.2026 00:25 — 👍 79    🔁 31    💬 3    📌 1
venmo: @renthelpmpls

venmo: @renthelpmpls

if you feel like passing around a link today and helping fundraise for rent that will actually get paid today (and in the next few days for families who have a grace period) you can send here.

we will be going hard all day. i won’t be posting about it because I don’t want to flood your feeds.

31.01.2026 18:10 — 👍 526    🔁 602    💬 11    📌 30

This judge is PISSED.

Good

31.01.2026 21:15 — 👍 37    🔁 5    💬 0    📌 0

Funding agencies too while we’re at it. Hearing lots of stories of hallucinated references in proposals

31.01.2026 20:10 — 👍 12    🔁 0    💬 1    📌 0

I think journals should do this too

31.01.2026 18:59 — 👍 26    🔁 2    💬 1    📌 0

Imo the arXiv should impose an automatic ban the first time someone submits a preprint with a hallucinated reference in it. Zero tolerance policy.

31.01.2026 18:54 — 👍 90    🔁 18    💬 6    📌 0

A citation isn't a pointer to another instance of a topic being mentioned. A citation is an intentional acknowledgement of existing work because you are building on it, or it provides context for what you are trying to do. That is something the author has to appreciate and then communicate.

31.01.2026 18:50 — 👍 69    🔁 18    💬 3    📌 0

They used "anti-semitism" as a pretext to deport foreign-born students and chill free speech, and their deportation chief -- the one with the nonstandard Hugo Boss-style greatcoat -- was spouting anti-semitic insults at a US attorney

31.01.2026 17:02 — 👍 4580    🔁 1321    💬 102    📌 43

A lot of independent bookstores closed yesterday in protest of the gestapo which means today is a good day to shop indies like @loyaltybooks.bsky.social 🌈🤸🏽💙📚

31.01.2026 15:13 — 👍 98    🔁 34    💬 1    📌 4
Preview
Tesla's own Robotaxi data confirms crash rate 3x worse than humans even with monitor Tesla’s nascent robotaxi program is off to a rough start. New NHTSA crash data, combined with Tesla’s new disclosure of...

New NHTSA crash data, combined with Tesla’s new disclosure of robotaxi mileage, reveals Tesla’s autonomous vehicles are crashing at a rate much higher than human drivers, and that’s with a safety monitor in every car.

Tesla has reported 9 crashes involving its robotaxi fleet in Austin, TX.

/1

30.01.2026 17:09 — 👍 2280    🔁 972    💬 114    📌 114

Never mind the jobs you had, tell me five classes you took in college:

Drugs and the brain
Offensive Literature
Intro to Geobiology
Track and field
The Supreme Court in US History

31.01.2026 04:39 — 👍 20    🔁 0    💬 6    📌 5

5

31.01.2026 02:54 — 👍 1    🔁 0    💬 0    📌 0

There are a number of pictures of them trying to herd the bird

31.01.2026 01:02 — 👍 0    🔁 0    💬 0    📌 0

@planetdr is following 20 prominent accounts