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Dr./Prof. Meredith MacGregor

@mmacgreg.bsky.social
2.1K followers 536 following 197 posts

Associate Professor at Johns Hopkins in the Department of Physics and Astronomy | astronomer, educator, ceramicist, runner, mom | Pronouns: she/her

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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 05/10/2026
Come join us! Reach out if you have any questions!
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Reposted by Dr./Prof. Meredith MacGregor
Johns Hopkins Arts & Sciences @jhuartssciences.bsky.social · 01/10/2026
Three Hopkins physicists are helping build NASA's next space telescope. PRIMA will study far-infrared light to reveal how planets, stars, and black holes form, and even how water arrived on Earth, with a target launch in 2033. hub.jhu.edu/2026/09/30/n...
hub.jhu.edu
NASA space telescope project advances with three Hopkins team members
By studying radiant energy that only emerges in the far-infrared, PRIMA will provide new insight on the formation of planets, stars, black holes, and even how water on Earth came to be
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 29/09/2026
Agreed! I’m just wondering happened now to make them come out with this new rule…
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 29/09/2026
They were just keeping me under page count so its more like...
static.klipy.com
Kelsee Says 'I Am At The Limit'
ALT: Kelsee Says 'I Am At The Limit'
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 29/09/2026
Just me over here removing all of my \vspace commands... 🫣
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 26/09/2026
Great article to learn more about PRIMA: skyandtelescope.org/astronomy-ne...
skyandtelescope.org
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 24/09/2026
Woohoo!!!!!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 23/09/2026
YES!!! LET'S GO PRIMA!!! Such a joy to be part of this wonderful team 🌌🔭🚀 www.nasa.gov/news-release...
nasa.gov
NASA Selects Far-Infrared Telescope as First in New Mission Class - NASA
NASA announced Wednesday a mission to explore the history and evolution of the universe, PRIMA (PRobe far-Infrared Mission for Astrophysics), is advancing to
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 10/09/2026
One thing that sticks with me now that the SMEX proposals are all in - My daughter was born right after the initial gate review at JPL for EVE. Now, she's 2. Amongst our science team, we have had 3 more EVE babies. Really makes you realize how long it takes to develop one of these concepts! #PIDaily
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 09/09/2026
YES!!! Congrats to all and a virtual cheers with your beverage of choice! 🍷🍹🍸
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 08/09/2026
IT IS SUBMITTED!!! I still can't quite believe it 🤩🍷🚀 #PIDaily And, if you want to learn more about the fabulous EVE team and amazing science that we will do, check out our website: sites.krieger.jhu.edu/eve/
The cover page for the EVE - Early eVolution Explorer mission submitted to the NASA Small Explorer (SMEX) call in September 2026.  A young planetary system is shown in three colors (blue, green, and red) representing the three simultaneous bands of EVE (NUV, visible, NIR).
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 01/09/2026
Fun Solar System paper looking at fragmenting Comet C/2025 K1 (ATLAS) on the arXiv today led by awesome grad student Carl Ingebretsen: arxiv.org/abs/2608.29698
arxiv.org
Gemini and Apache Point Multi-band Optical Imaging Characterization of Fragmenting Long-period Comet C/2025 K1 (ATLAS)
We present results from multi-band g, r, and i, observations of C/2025 K1 (ATLAS) taken with the Gemini North 8.1-m/GMOS imager on 2025 December 6 and December 24, and u, g, r, i, and z observations w...
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 30/08/2026
Go Roman Go! 🚀 So excited to get to work with this amazing data soon!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 25/08/2026
And last but not least, Mark Swain's paper looking at the competing roles of disk-driven and planet-planet dynamical migration in sculpting planetary system architecture in the inner 1.5 au of protoplanetary disks: arxiv.org/abs/2608.22649
arxiv.org
Exoplanet System Architecture: Sculpting the Inner Regions
In this study, we seek to improve our understanding of the competing roles of disk-driven and planet-planet dynamical migration in sculpting planetary system architecture in the inner $\lesssim 1.5$ a...
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 25/08/2026
Next, is a paper by Laura Venuti presenting a new method for determining the truncation radius in young accreting systems that hinges on the color dependence of the accretion shock emission in multi-band time-domain surveys: arxiv.org/abs/2608.23351
nam02.safelinks.protection.outlook.com
Preparing for the Early eVolution Explorer: Photometric Diagnostics of Magnetospheric Accretion Geometry in Young Stellar Objects
The inner disk truncation radius, $R_T$, plays a crucial role in the regulation of star-disk interaction and the early evolution of star-disk-planet systems; however, measuring this parameter is obser...
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 25/08/2026
It's a big day for EVE papers on the arXiv! First up is a paper led by @jhuartssciences.bsky.social graduate student Jaime Crouse exploring the effect of flare temperature on ozone photochemistry in Earth-like atmospheres: arxiv.org/abs/2608.23548
arxiv.org
Preparing for the Early eVolution Explorer: The Impact of Flare Temperature on Ozone Column Depth in Earth-Like Atmospheres
Atmospheric photochemical models incorporating the impacts of stellar flares often assume a $\sim$9,000 K spectrum at ultraviolet-optical wavelengths. Recent multiwavelength observations, however, rev...
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 04/08/2026
I GOT TENURE!!!!!!!!!!!!!!!!!!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 15/06/2026
James Rogers gave a fantastic talk about how young planets probe planet formation at #CoolStars23 and shouted out how EVE will dramatically change our understanding of this
James Rogers giving a talk about the Early eVolution Explorer (EVE) at the Cool Stars 23 meeting in Tokyo, Japan
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 10/06/2026
Now seems like a great moment to share this awesome new paper explaining how the Early eVolution Explorer (EVE) - a NASA SMEX mission concept - will transform our understanding of young planets (<50 Myr old): arxiv.org/pdf/2606.04283
arxiv.org
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 09/06/2026
Time to actually do this whole SMEX proposal thing! #PIDaily
static.klipy.com
Amy Poehler as Leslie Knope: Let's Do It Dance!
ALT: Amy Poehler as Leslie Knope: Let's Do It Dance!
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Reposted by Dr./Prof. Meredith MacGregor
Hannah Richter @hannah-richter.bsky.social · 05/06/2026
The OMB's sweeping proposed changes to U.S. grant funding have racked up over 6,000 comments this week. 📃🛰️ In @skyandtelescope.bsky.social, astronomers weigh in on just how destructive these ideas would be for space science: skyandtelescope.org/astronomy-ne... #trump #omb #nasa
skyandtelescope.org
Proposed U.S. Grant Funding Rules Spark Worry, Backlash in Astronomy
The Office of Management and Budget envisions diminishing peer review and international collaborations.
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 28/05/2026
Another crazy week - PRIMA student collaboration site visit on Tuesday. EVE STMC review today. Red eye flight tonight. Innovation for Astrophysics workshop in DC tomorrow. Sleep? Not so much 🫠#PIDaily
static.klipy.com
Lorelai Gilmore: I Need Coffee in an IV
ALT: Lorelai Gilmore: I Need Coffee in an IV
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 13/05/2026
And this time it’s for real (and still very early) - Go PRIMA! 🌌🚀
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 12/05/2026
Hello JPL! It’s 7am and I’m wearing a suit. Let’s do this 💪
A photo of me holding a very large coffee at NASA JPL
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 08/05/2026
Ugh (that’s about all I’ve got at this point in the semester 🫠 I quite literally posted grades at about 4pm today so I think I just squeaked through…)
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 08/05/2026
And now I’m feeling really glad I finished my grading about an hour before this… 🫠
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 28/04/2026
Got an RSV vaccine! ✅ Always a good feeling when I can protect myself from getting dangerously sick from something preventable 💉
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 25/04/2026
It’s Physics Fair day here at @jhuartssciences.bsky.social! If you’re local come check it out!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 24/04/2026
Wow thanks everyone who voted for me...! I'm honored to get to have a chance to contribute to the AAS elected leadership aas.org/posts/news/2...
aas.org
Results of the 2026 AAS Election
The 2026 AAS Election closed on 20 April and the results are in!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 23/04/2026
Sounds like you need a nap, too!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 23/04/2026
Also, I seriously need a nap 😴
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 23/04/2026
PRIMA Mock Site Visit ✅ EVE Baseline Commitment Review ✅ ALMA proposals submitted ✅ 6am flight back to BWI ✅ See you again in just a few weeks JPL! #PIDaily
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 20/04/2026
Thank you!!!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 20/04/2026
Last piece of space pottery for the Physics Fair next weekend! I made these bowls to look like the interstellar medium - the space in between stars. Love how the glaze pops in the sunlight 🌌
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 17/04/2026
First attempt at sgraffito - I really like how the combo of black underglaze with the white clay (Standard 182) came out looking like chalk on a chalkboard #sciart #pottery
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 14/04/2026
Finished the full set of Solar System trinket dishes I shared earlier! #sciart
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 11/04/2026
In honor of the successful landing of Artemis II, here’s a moon bowl! I made the bowl and then cratered it to look like the surface of the moon #sciart
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 03/04/2026
Welcome to Baltimore! 🦀
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 03/04/2026
First up are little trinket dishes that I hand painted with Solar System planets. There will be one for every planet in the end but not all of them have been fired yet.
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 03/04/2026
I started making ceramics last summer and it has become a big part of my life that I haven’t shared here yet. For our annual department outreach event, I agreed to make space inspired pottery for prizes and giveaways. I’ve started getting final pieces out of the kiln and it’s so fun I have to share!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 02/04/2026
(Also an interesting moment watching the launch while getting off an airplane in Atlanta and realizing how many people had no idea this was happening)
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 02/04/2026
We’ve never gone to the Moon since I’ve been alive - until now. There’s A LOT awful going on, but it was still so amazing to watch the Artemis II launch. What amazing things us humans are capable of 🚀🌔
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 19/03/2026
There is altogether too much white in all of those outfits…!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 06/03/2026
Always a fun day when your research ends up on APOD! 🤩 apod.nasa.gov/apod/astropi... And, check out the original paper, too: iopscience.iop.org/article/10.3...
apod.nasa.gov
Astronomy Picture of the Day
A different astronomy and space science related image is featured each day, along with a brief explanation.
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 05/02/2026
Our AAS Education Committee report on 'The Landscape of Undergraduate Astronomy and Astrophysics Degree Requirements' is now available on arXiv: www.arxiv.org/abs/2602.03959. Please give it a read!
arxiv.org
The Landscape of Undergraduate Astronomy and Astrophysics Degree Requirements
In this document we summarize the results of a survey of undergraduate degree-granting programs conducted by the 2024-2025 American Astronomical Society Education Committee's Subcommittee on UndeRgrad...
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 29/01/2026
Some new recommendations from our AAS Working Group on Graduate Admission: aas.org/posts/news/2...
aas.org
AAS Working Group Recommends New Best Practices for Graduate Admissions
The Working Group on Graduate Admissions wishes to highlight two recommendations for immediate adoption by the community to improve the current astronomy-wide graduate admissions process.
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 08/01/2026
So excited to see our EVE science highlighted in Evgenya Shkolnik’s fantastic plenary at #AAS247! I’m thrilled to be proposing this mission to NASA
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 07/01/2026
IRSTIG splinter now in Room 231!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 07/01/2026
And now it’s the PRIMA special session in Room 224B!
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Dr./Prof. Meredith MacGregor @mmacgreg.bsky.social · 07/01/2026
First up are a bunch of talks (including mine!) about the POEMM balloon mission in the 10am session in Room 222C
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