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Josh Lothringer

@jlothringer.bsky.social
239 followers 176 following 52 posts

Assistant Astronomer at @spacetelescope.bsky.social researching exoplanet and brown dwarf atmospheres. Opinions expressed are my own. jlothringer.github.io

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Reposted by Josh Lothringer
Taylor Bell @taylorbell275.bsky.social · 11/08/2026
ExoCTK v2026.7 and PandExo v2026.7 are now out! Highlights: • MIRI/LRS + NIRCam/DHS contamination support • Faster, more accurate NIRISS/SOSS contamination • New multistripe modes and MIRI/LRS subarrays in PandExo • Many fixes and improvements Check them out at exoctk.stsci.edu 🔭🪐 #exoplanet
ExoCTK LogoPandExo Logo
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JWST Observer @jwstobserver.bsky.social · 20/07/2026
The Cycle 6 Call for Proposals for the James Webb Space Telescope (#JWST) General Observer and Survey time and funding for Archival Research has been released. Read more: ow.ly/g9q150Zq3Ww
Magnified view of hexagonal shapes showing various space images illustrating JWST's science themes
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Erin M. May, PhD @astronomay.bsky.social · 09/07/2026
New Paper Day! JHU Grad Student @spschmidt.bsky.social 's paper on the ultra hot Jupiter KELT-7b includes a new method to mitigate charge migration in JWST NIR detectors, and finds a metal rich atmosphere for KELT-7b relative to its metal rich star 🪐⭐ arxiv.org/abs/2607.06708 #Exoplanets 🧪🔭
arxiv.org
Mitigating Charge Migration in JWST NIRISS Reveals That KELT-7 b is a Metal-enriched Ultra-hot Jupiter Orbiting a Young Metal-rich Star
We present the first panchromatic JWST transmission spectrum of an ultra-hot Jupiter, combining NIRISS and NIRSpec observations to constrain KELT-7\,b's atmospheric properties. We show evidence for ch...
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Space Telescope Science Institute @stsci.edu · 09/07/2026
NEWS: Can rocky exoplanets hold an atmosphere? A major milestone brings us closer to answering that question. The Rocky Worlds DDT team has completed its first coordinated #NASAWebb and Hubble observations: news.stsci.edu/4v80qpM 🔭 🧪
Artist’s concept of a star and planet. The star takes up the majority of the illustration. It is reddish orange with many flares, and the surface resembles lava. The planet appears as a small, dark grey silhouette passing in front of the top left side of the star. The words “Artist’s Concept” appear at the bottom right of the illustration.
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Dr Ryan MacDonald @distantworlds.space · 01/07/2026
🚨 New research alert 🚨 We have found an atmosphere on a planet orbiting a dead star 🔭✴️💀🪐 Our James Webb Space Telescope (JWST) observations of the white dwarf planet WD 1856b give us a preview into the fate of planets like Jupiter after the death of the Sun. 🧵⬇️ (1/10)
Artist concept of the white dwarf planet WD 1856b

Caption:
Exoplanet WD 1856 b, shown in this artist’s concept, is a gas giant that survived the death of its star. It now orbits a white dwarf at a distance 50 times closer than Earth orbits the Sun. Observations by NASA’s James Webb Space Telescope not only determined the planet’s temperature but also detected molecules in its atmosphere. The former measurement provides evidence that WD 1856 b migrated to its current location billions of years after its star became a white dwarf.

Credits:
NASA, ESA, CSA, Ralf Crawford (STScI)
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Josh Lothringer @jlothringer.bsky.social · 22/06/2026
We're hiring!! 2+1 year postdoc at STScI. Come work with Leo on me on a few HST and JWST programs looking at ultra-hot Jupiters. Ping me or Leo with any and all questions.
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Josh Lothringer @jlothringer.bsky.social · 05/06/2026
ICYMI: We wrote a white paper on the transiting exoplanet science that the Hubble Space Telescope can help address in the years to come. There's still a lot that we need the telescope for, and synergy with JWST continues to open new doors. Check it out here: arxiv.org/abs/2606.04144 #exoplanets
arxiv.org
Characterizing Transiting Exoplanet Atmospheres in the 2030s with the Hubble Space Telescope
The Hubble Space Telescope inaugurated the era of exoplanet atmospheric characterization. While the James Webb Space Telescope has largely taken up the mantle of infrared atmospheric characterization,...
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Keith Smith @drkeithsmith.bsky.social · 21/05/2026
Observations of #exoplanet atmospheres usually produce a combined spectrum of the morning and evening sides. Mukherjee et al. have used JWST to separate the two for a hot jupiter. They find very different spectra: a clear warm wet evening vs a cold cloudy morning. ☄️🔭🧪 www.science.org/doi/10.1126/...
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Lee Billings @leebillings.bsky.social · 21/05/2026
Now on @sciam.bsky.social: NASA's JWST just delivered a fascinating weather report for the distant exoplanet WASP-94A b, finding the gas-giant world has partly cloudy skies. By @krcallaway.bsky.social. www.scientificamerican.com/article/jwst...
scientificamerican.com
Today’s weather forecast is partially cloudy—on exoplanet WASP-94A b
An out-of-this-world weather report from NASA’s James Webb Space Telescope reveals how clouds move across a giant planet hundreds of light-years from Earth
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Josh Lothringer @jlothringer.bsky.social · 18/05/2026
These are awesome positions where you'll play critical roles in STScI's missions (HST, JWST, Roman)! Definitely apply if interested! Feel free to reach out if you've any questions.
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Space Telescope Science Institute @stsci.edu · 24/04/2026
Well, isn’t this a sight for sore eyes! 😍 Our beloved Hubble appears in this amazing image from one of Vantor's WorldView Legion satellites. It was 36 years ago today that Hubble was launched in the bay of the Space Shuttle Discovery from NASA’s Kennedy Space Center. Credit: Vantor.
A detailed image of the Hubble Space Telescope floating in space, showing its solar panels and cylindrical body in space.
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barbylon @barbylon.bsky.social · 06/04/2026
If you're following along today for the #ArtemisII flyby, here's some notes on what to expect. 🧪🔭🚀🌘
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JWST Observer @jwstobserver.bsky.social · 13/03/2026
The #JWST Cycle 5 General Observer Program selections have been made. Find out what JWST will study in its fifth year of science, which begins July 1, 2026: ow.ly/M4UQ50YtvP4
Illustration of Webb's hexagonal mirror segments each showing a different space image centered on a starry background
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A. Suárez Mascareño @asuarezmascareno.com · 05/02/2026
Been checking the science topics of the proposals approved by the ESO OPC for ESPRESSO. 75% of the time went to one type of proposal. Statistics-focused follow up of transiting systems. There isn't a single proposal focused on discoveries, atmospheres, or anything low-mass planets 🔭#exoplanets
Distribution of the topics of approved proposals for ESPRESSO in Period 117. 74.6 Transit follow up, 3.5% studies of systems around binaries (unclear if its transiting systems), 0.3% for RM studies, 11% for stellar physics, 0.4% for milky way studies, and 10.2% for cosmology.
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Josh Lothringer @jlothringer.bsky.social · 29/01/2026
One of my new fav. astronomy plots - so much cool physics in one plot!
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Brett Morris @brettmorr.is · 27/01/2026
New job opportunity at @stsci.edu: Senior Astronomical Data Scientist for data analysis tools, working closely with my team and me. This role is very similar to mine. If you have questions, I'm happy to answer them. 🧪🔭
recruiting2.ultipro.com
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Space Telescope Science Institute @stsci.edu · 07/01/2026
Applications are open for STScI's Space Astronomy Summer Program: an opportunity for college students to work with researchers and staff on projects that include astrophysics research; science software engineering; science instrument calibration; and science public outreach: bit.ly/4ptMkfs 🔭
Group of people standing in a room with posters and models related to space exploration, including a banner for the Nancy Grace Roman Space Telescope.
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Josh Lothringer @jlothringer.bsky.social · 12/01/2026
ICYMI: Over the winter holidays, my student's paper on KELT-9b was accepted: arxiv.org/abs/2512.19662! With the Hubble Space Telescope's STIS instrument, we find enormous escape of metal ions from the hottest hot Jupiter, KELT-9b! 🪐🔭💫
arxiv.org
A High-Resolution NUV Transmission Spectrum of KELT-9b: Mg II and Fe II Escaping from the Hottest Known Giant Planet
We present high-resolution NUV observations from Hubble Space Telescope's (HST) Space Telescope Imaging Spectrograph (STIS) data for the hottest known gas planet, KELT-9b. Observations were collected ...
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Casey Dreier @caseydreier.bsky.social · 05/01/2026
Very good news for NASA Science in the compromise 2026 funding bill released by Congress today:
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USA TODAY @usatoday.com · 17/12/2025
Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.
bit.ly
Trump moves to dismantle major US climate research center in Colorado
The Trump administration is breaking up the National Center for Atmospheric Research, taking aim at one of the world's leading climate research labs.
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Julien Girard @juliengirard.space · 05/12/2025
The CHesapeake bay area EXOplanet Meeting #CHEXO12 has started @jhuapl.bsky.social with a nice and big crowd despite the snow! www.chexo.org #exoplanets
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John Debes @johndebes.bsky.social · 17/11/2025
Hey #astrosci community! After working on this project for 3 years, there's a new Hubble Spectroscopic Legacy Archive that's just been newly made available at @stsci.edu: archive.stsci.edu/missions-and... follow me to learn more! (1/n)
A logo "HSLA" which stands for Hubble Spectroscopic Legacy Archive, has three stylized spectra with rainbow colors radiating from left to right. In the background are stars, galaxies, and a giant planet.
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Josh Lothringer @jlothringer.bsky.social · 31/10/2025
We've collected 65 individual exoplanet atmosphere composition measurements to look for population-level trends 🔭 #exoplanets To do this, we had to create a toolkit to standardize between definitions of . We call it ExoComp. (Yes, that's a Star Trek reference 😀).
A logo with text "ExoComp" with a robot scanning the "O".
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Josh Lothringer @jlothringer.bsky.social · 16/10/2025
Abstracts are due by tomorrow for the 12th installment of the Chesapeake Bay Area Exoplanet Meeting! The meeting will be December 5th, 2025 at JHU Applied Physics Lab. Hope to see you there. www.chexo.org/chexo12
chexo.org
chexo.org - CHEXO #12
The Chesapeake Bay Area Exoplanet Meeting brings together all lovers of exoplanets and related science from the DC area and beyond. This series of one-day meetings enable the sharing of ideas in an in...
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Josh Lothringer @jlothringer.bsky.social · 03/10/2025
The last day to register for STScI's fall workshop is today! www.stsci.edu/contents/eve...
stsci.edu
Atmospheric Escape and Replenishment in Planetary Systems Workshop
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Alexandra Witze @alexwitze.bsky.social · 29/09/2025
A leading Democrat in the Senate just released an important report documenting how NASA has been working to implement the president's proposed budget, not Congressionally approved funds, in slashing missions. Read more ⬇️
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MAST - Mikulski Archive for Space Telescopes @mast-news.bsky.social · 17/09/2025
New HLSP: First results from the Rocky Worlds DDT program are now available at MAST! This release includes calibrated light curves, model fits, preliminary eclipse depth estimation, and auxiliary data for GJ 3929 b. archive.stsci.edu/hlsp/rocky-w... #HLSP #RockyWorlds #JWST #HST #Exoplanets #MAST 🔭
An example fit to a JWST/MIRI F1500W eclipse observation of GJ 3929b collected by the Rocky Worlds DDT Program.
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Josh Lothringer @jlothringer.bsky.social · 10/09/2025
Registration is open now for our fall workshop on Atmospheric Escape and Replenishment in Planetary Systems! 🔭 #exoplanets
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Douglas Long @minimillian.bsky.social · 04/09/2025
The Rocky Worlds DDT has published our final target list. Join us for an information session on September 15 to learn more about the 9 targeted planets and the goals of the program. 🔭 #exoplanets
stsci.edu
Rocky Worlds DDT Updates: Final Target List and Virtual Information Session
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Marc Postman @astromarc.bsky.social · 28/08/2025
STScI is now accepting applications for the Giacconi Fellowship in astrophysics. Start date is Fall 2026 and funding is available for 3 years. More info here: www.stsci.edu/stsci-resear...
stsci.edu
Giacconi Fellowship
Learn about the requirements for STScI’s Giacconi Fellowship, which recognizes postdoctoral researchers in astronomy, astrophysics, and planetary science.
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UArizona Lunar and Planetary Laboratory @uarizonalpl.bsky.social · 25/08/2025
The application to join the LPL Planetary Sciences PhD program is now open! Visit lpl.arizona.edu/admissions for more information.
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Josh Lothringer @jlothringer.bsky.social · 15/08/2025
I'm very excited to be able to share Yayaati Chachan's Hubble/WFC3 transit spectrum of ultra-hot Jupiter KELT-20b. Using *all* of WFC3's grisms, we get a 0.2-1.7 micron spectrum showing absorption by metals at in the UV and only weak absorption by water in the IR. 🔭🪐
A plot of a spectrum of transit depth versus wavelength showing large NUV absorption and weak H2O absorption at NIR wavelengths.
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Space Telescope Science Institute @stsci.edu · 07/08/2025
NEWS: Will you be my neighbor? #NASAWebb has found strong evidence of a gas giant planet orbiting Alpha Centauri A, a star in the stellar system closest to our own sun: webbtelescope.pub/4oyLiQa 🔭 🧪
Three panels, each showing a different view of the binary star system Alpha Centauri. The panel on the left is a Digitized Sky Survey image showing a single bright blue point source at the center of a black image with stars scattered throughout. The center of this source is outlined with a vertical box, tilted slightly to the left, with two diagonal lines leading to the second panel. The 2nd panel is a Hubble image that shows 2 white stars with 4 diffraction spikes each against a black background. The top star is labeled Alpha Cen B and the bottom Alpha Cen A. Alpha Cen A is outlined with a white square with 2 diagonal lines leading to the 3rd panel at the furthest right, which shows a Webb image of the star. An orange star icon and central black circle outlined in white marks the location of Alpha Cen A. A large white circle outlines a blurry red-toned field that surrounds the location of the star.  A bright orange blob at 9 o’clock in relation to the star is labeled “S1” and circled.
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Josh Lothringer @jlothringer.bsky.social · 14/07/2025
Abstracts close this Friday for the Fall 2025 STScI Science Workshop on Atmospheric Escape and Replenishment. We'd love to see you in Baltimore in November! Check it out and let me know if you've any questions. 🔭 #exoplanets www.stsci.edu/contents/eve...
stsci.edu
Atmospheric Escape and Replenishment in Planetary Systems Workshop
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John Debes @johndebes.bsky.social · 25/06/2025
Like #Hubble spectra, but it's hard to access? My working group @stsci.edu launched the Hubble Advanced Spectral Products, joining COS and STIS spectra across different modes and instruments for every HST program for the first time 🧪🔭https://archive.stsci.edu/missions-and-data/hst/hasp (1/4)
The logo for the Hubble Advanced Spectral Products, or HASP. White lettering with a rainbow border below. To the right is a set of stylized spectra ranging from violet to red that are in the process of "hooking" together. A hasp is a latching mechanism, which is similar to what HASP does--link different gratings from HST spectroscopy together.
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NSF–DOE Rubin Observatory @rubinobservatory.org · 23/06/2025
Introducing...your sneak peek at the cosmos captured by NSF–DOE Vera C. Rubin Observatory! Can you guess these regions of sky? This is just a small peek...join us at 11am US EDT for your full First Look at how Rubin will #CaptureTheCosmos! 🔭🧪 #RubinFirstLook ls.st/rubin-first-look-livestream
A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. The image focuses on a collection of interacting galaxies connected by delicate streams of stars. At top center lies a large elliptical galaxy that is dense and smooth, like a polished stone glowing with golden light. Like delicate spider silk or stretched taffy, these stellar bridges link the large elliptical to the few larger galaxies beneath, evidence of past collisions.

All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black. A cosmic tapestry of glowing tan and pink gas clouds with dark dust lanes. In the upper right, the Trifid Nebula resembles a small flower in space. Its soft, pinkish gas petals are surrounded by blue gas, and streaked with dark, finger-like veins of dust that divide it into three parts. It radiates a gentle, misty glow, diffuse and soft like the warmth of breath on a cold hand. To the lower left, the much larger Lagoon Nebula stretches wide like a churning sea of magenta gas, with bright blue, knotted clumps sprinkled throughout where new stars are born. Both nebulae are embedded in a soft tan backdrop of gas that is brighter on the left than on the right, etched with dark tendrils of dust and sprinkled with the pinpricks of millions of stars.A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. To the lower left is a region filled with the hundreds of golden glittering gems of a distant galaxy cluster. In the foreground, below and right of center, two blue spiral galaxies look like eyes beneath the entangled mass of a triple galaxy merger in the upper right. A few bright blue points of foreground stars pierce the glittering tapestry.

All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.
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Space Telescope Science Institute @stsci.edu · 23/04/2025
Celebrate Hubble’s 35th year in orbit! In honor of the legendary space telescope that redefined the universe, NASA released an assortment of observations recently taken by Hubble, including data used in this video of Mars at the start of Martian spring. (1/5) 🧵 🧪 🔭
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Dr. William O. Balmer @balmer.bsky.social · 22/04/2025
<The Biggest Planet We Know Is Doomed> I don't know if that's good enough clickbait but I am intensely proud of Gavin Wang (recent Goldwater winner!) whose paper "A Revised Density Estimate for the Largest Known Exoplanet, HAT-P-67 b" was accepted to AJ and is on arXiv: arxiv.org/abs/2504.13997
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Eric Lopez @astroericl.bsky.social · 11/04/2025
tbc this is only a proposal and is just the start of the FY26 budget process, but jfhc this is apocalyptically bad! a 50% cut to science (2/3 to Earth Science!), cancelling all upcoming missions, even ones mostly built like Roman, and fully closing Goddard arstechnica.com/space/2025/0...
arstechnica.com
Trump White House budget proposal eviscerates science funding at NASA
“This would decimate American leadership in space.”…
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Sean Carroll @seanmcarroll.bsky.social · 03/04/2025
Until a couple of months ago, this sign hung in the lobby of the Space Telescope Science Institute: "STScI promotes an inclusive, equitable workplace and cultivates a diverse, engaged workforce." It has now been removed.
Lobby plaque with motto proclaiming the virtues of inclusiveness, equitability, diversity, and engagement.Blank wall after plaque has been removed, presumably reflecting an underlying change in values.
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Casey Dreier @caseydreier.bsky.social · 25/03/2025
Using public data, I've found 40 NASA contracts totaling $42M canceled in the past few days, impacting climate science, DEI, education, and administration activities. $25.2M was already paid out, so resulting savings is $17 million. Running list of cancelations here: docs.google.com/spreadsheets...
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Josh Lothringer @jlothringer.bsky.social · 20/03/2025
🔭 New paper day on the arXiv! arxiv.org/abs/2503.15472 We observed ultra-hot Jupiter WASP-178b with HST and JWST to try to figure out where the planet comes from!
arxiv.org
Refractory and Volatile Species in the UV-to-IR Transmission Spectrum of Ultra-hot Jupiter WASP-178b with HST and JWST
The atmospheres of ultra-hot Jupiters are unique compared to other planets because of the presence of both refractory and volatile gaseous species, enabling a new lens to constrain a planet's composit...
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Michael Wong @miquai.bsky.social · 20/03/2025
This is extraordinarily disturbing and borderline Orwellian. It must stop, or we wind up in a very, very scary place.
theguardian.com
French scientist denied US entry after phone messages critical of Trump found
France’s research minister said the scientist was traveling to Houston for a conference when his phone was searched
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Brett Morris @brettmorr.is · 19/03/2025
The atomic spectral lines in this app come from the NIST atomic spectroscopy group, which has provided the world with spectroscopic measurements for 120 years. Today we got word that the federal government is laying off the entire group. 🔭🧪
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Dr. William O. Balmer @balmer.bsky.social · 17/03/2025
Tada webbtelescope.org/contents/new...
webbtelescope.org
NASA's Webb Images Young, Giant Exoplanets, Detects Carbon Dioxide
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Dr Ryan MacDonald @distantworlds.space · 11/03/2025
🔭 The JWST Cycle 4 science program is out today! 🔭 Some truly exhilarating #exoplanet programs will be carried out by JWST starting in July 2025. Let's take a look at some highlights. 🛰️🔭🪐 THREAD (1/9)
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Kellen Lawson @kellenlawson.bsky.social · 11/03/2025
Quoth me from last year on the other place:
A screenshot of a tweet reading as follows:

To everyone who got bad JWST news today, here's what I often say to myself after reading a negative proposal review:

...

...

...

"WHAT DO YOU MEAN THE PROPOSAL DOESN'T EXPLAIN [X]!? THERE'S LITERALLY AN ENTIRE HALF A PAGE EXPLAINING [X]"

Hope that helps!
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Eric Berger @sciguyspace.bsky.social · 07/03/2025
So long, Solar System. arstechnica.com/space/2025/0...
arstechnica.com
White House may seek to slash NASA’s science budget by 50 percent
“It would be nothing short of an extinction-level event for space science.”…
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Brett Morris @brettmorr.is · 24/02/2025
Tired of wondering which atomic lines are in your spectra? You need: *whose line is it anyway?* An interactive tool for identifying atomic spectral lines. 🧪🔭 #stars install: pip install whoseline source: github.com/bmorris3/who...
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Casey Dreier @caseydreier.bsky.social · 18/02/2025
www.planetary.org/press-releas...
planetary.org
The Planetary Society Strongly Opposes Mass Layoffs of Probationary…
Sudden, indiscriminate layoffs at NASA do not serve the national interests in space leadership.
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