Jackie Clark

The Earth's core-mantle boundary separates two very different geologic realms—but new evidence suggests the core is somehow leaking out to the surface.

"In a sense, it's the meeting of two planets," @umdgeology.bsky.social's Ved Lekić told @quantamagazine.bsky.social ➡️ go.umd.edu/20yf

Yes! We would often stop at the Old Heidelberg Bakery in Phoenix (then stop at German Sausage Co. down the road). We now live on the East Coast and we've been blessed by Lidl's presence. My German husband approves of their bread and brezeln.

Opinion | Mark Kelly: My Fix for NASA

A poignant article by Senator Mark Kelly on how ensuring a continued American presence in space is crucial to keeping our country’s engine of science and innovation moving.

Planetary Science MS/PhD Positions for Fall 2026 Crowd sourced list of people who are looking for MS/PhD students to help connect prospective students with advisors so we can do even more fabulous planetary science! (Submitting a response indicates ...

I am community sourcing a list of people who are actively in search of MS/PhD students in planetary science/astrobiology/exoplanets for Fall 2026. If you are such a person, please fill out the following google form:
docs.google.com/forms/d/e/1F...

It does frustrate me that the west couldn't add more pazazz when they rebuilt the cities after WWII. Many don't look better than the eastern blocks.

Image shows a series of small mounds with depressions at their tops located next to ridged formations. Some of the ridges are thin but others are very thick and large. (NASA/JPL-Caltech/University of Arizona)

HiPOD: Ridges in Acidalia Planitia

The goal of this observation is to investigate the structure of these ridges as well as their superposition and crosscutting relationships with adjacent geologic units and landforms.

uahirise.org/hipod/ESP_07...
NASA/JPL-Caltech/University of Arizona
#Mars #NASA

Graph of depth to groundwater in a well, showing sudden water level oscillations of up to about 1 foot, starting around 7:45PM eastern on July 29, 2025.

Look at that hydrograph! This is from a USGS monitoring well in Christiansburg, Montgomery County, VA. Observation well 27F2 SOW 019 is 450' deep, completed in carbonate rocks of the Elbrook Formation and well known for its response to quakes.

⚒️🧪

Data: waterdata.usgs.gov/monitoring-l...

Mapping for the Moon Mapping for the Moon

Mapping for the Moon. 📍🌚

What's the best route to discovery? @esa.int's PANGAEA geology training prepares astronauts for future lunar exploration in Lofoten, Norway. 🇳🇴

www.esa.int/ESA_Multimed...

Those budget admins and project lead who are navigating the chaos on behalf of the scientists are a godsend. Holy smokes.

US domestic conferences are also a fight to get allowance for federal employees and those using mission funds. What's maddening is that the regulations change daily, sometimes multiple times in the same day.

At first it seems overwhelming, but eventually you'll find your rhythm with the process. I used to strictly weigh everything but now I eyeball the water/flour ratio.

I guess if you bake enough, you don't ever really need to "discard" anything, but I don't. To keep it fed, I remove some of it and give it a fresh feeding....then back to the fridge it goes until I want to bake again.

I am le tired.

It's the sourdough that you throw out when you feed the starter. I typically save mine in the fridge for other recipes.

And for those interested in a teaching-focused job, UChicago is looking to replace me with a new assistant instructional professor! Review technically already began, but I was a late applicant when I got the job. DM or email if you have questions about the role: apply.interfolio.com/168942

Without federal funding, public media — and the truth-telling, community-connecting role it plays — is at risk.

Local stations may vanish. Millions could lose trusted news and vital information. If you are ready to join the fight for journalism, donate now: n.pr/458sOhq

The Easiest Sourdough Discard Bread Ever! Bake this easy sourdough discard bread in under 2 hours - it's a simple and delicious way to utilise your discard purposefully.

If I'm feeling lazy and just want bread, then I use this recipe with my saved discarded sourdough in the fridge. www.pantrymama.com/the-easiest-...

Resignations and a ‘dissent’ letter suggest Trump has put NASA’s future in doubt It remains an open question as to whether NASA and the U.S. space program will survive the Republican president’s second term.

NASA’s warning signs are flashing. Senior staff are resigning, and hundreds of scientists are pushing back against Trump-era chaos.

The time to act is now.

Support the brave #NASA employees speaking out here👉 zurl.co/MaPnN

zurl.co/waBgk

I *am* a constitutional scholar and you are correct.

I have a sick kid at home and decide it's time to expose him to The Red Green Show. #ifwomendontfindyouhandsometheyllsurefindyouhandy

Hahaha, poorly timed.

LROC Featured Image - Fork in the Road: lroc.im-ldi.com/images/1269 #LROC #Moon #Tectonics

Is the Secret to Ultrarunning Success Downing Crazy High Carbs? Carbs are rising. Records are falling. David Roche is putting himself in the path of either victory or disaster to find out how related those facts are.

Finally, an excuse to pack doughnuts while #trailrunning! 😆

Way to go!

Happy #NationalMoonDay! 🌕 🌙 🌓 🌑

Let’s look at the Moon’s crust, which may be thinner than originally thought.

#Congress, we have a problem. Tell your representative to push back on the budget cuts! Find your Congressperson and other resources here: sites.google.com/view/nasanee...

There’s something you don’t see every day — an MCV moving east to west into California towards the Death Valley region:

A new volcanic #eruption has just begun moments ago on Iceland's Reykjanes Peninsula (far left side of video). This one so far appears to be well north of the town of Grindavik, along the north end of the dike that has fed all previous eruptions.

Event We're fighting for science, engineering, and exploration. Tell Congress to push back on the 2025 Presidential Budget Request that cuts NASA Science by 47% and NASA's full budget by 25%! Previous pro...

sites.google.com/view/nasanee... Protest in D.C. this Sunday, July 20, 2025, 2-6 pm. Location TBD, check the website for updates on Wednesday. Please share to get the word out. We're fighting for science, engineering, and exploration.

Invigorating the American Space Sector Requires Working With NASA, Not Against It | TechPolicy.Press When programs are cut to the bone, America loses much more than it gains, writes Janet Vertesi.

On news that ~2,145 senior-ranking NASA staff are set to leave under a Trump administration effort, resurfacing this from Janet Vertesi (@cyberlyra.bsky.social). It is possible to lose entire swaths of technical or scientific prowess—if you dismantle the teams and institutions responsible for them.