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Bob Pappalardo

@rpappalardo.bsky.social
626 followers 189 following 118 posts

Planetary scientist, icy moons a specialty. Europa Clipper Project Scientist at NASA’s JPL. Opinions are my own, or my cats'.

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Bob Pappalardo @rpappalardo.bsky.social · 28/09/2026
Congratulations to the ESA #JUICE mission for its successful gravity assist flyby of Earth earlier today, on its way out to Jupiter and the Galilean satellites!
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Paul Byrne @theplanetaryguy.com · 17/09/2026
HOLY SHIT NEW IMPACT CRATER ON THE MOON This crater is 222 m (728 ft) across, and formed in spring 2024. Statistical modelling tells us this is a 1-in-132 year event. So the last time a crater this big formed on the Moon was 1894.
A large crater with bright rays is situated in the centre of this image. The dark, pockmarked lunar surface makes up the background.
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Space Telescope Science Institute @stsci.edu · 15/09/2026
#NASARoman activated the Wide Field Instrument—a 300-megapixel infrared camera that will allow it to explore wide swaths of the cosmos quickly. This test image captures the very first photons of starlight to reach the instrument—taken as an initial performance assessment: go.nasa.gov/4rg4qEc
At the top, a grid of 21 panels shows a series of blue images with tiny neon green and yellow circles. A larger image highlights a section of the grid with circular patterns, and an inset presents a detailed star-like diffraction pattern. The colors consist of blue, green, and yellow.
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 10/09/2026
This has been slow to come out (I think we basically finished it nine months ago!) but here, finally, are the AAS Journals guidelines for the use of AI (mainly LLMs) in manuscript preparation and review. journals.aas.org/news/new-gui...
journals.aas.org
New Guidelines on AI Use in AAS Journals - AAS Journals
The AAS Publications Committee is pleased to share guidelines for the use of artificial intelligence (AI) tools, including large language models, in preparing and reviewing manuscripts submitted to th...
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Paul Byrne @theplanetaryguy.com · 09/09/2026
Astrophotographer Adam (AJ) Smadi caught this image a few hours ago from Washington state. A thin crescent Moon, sunlight illuminating the rugged lunar surface. And 2,400 times farther away—and on the other side of the Sun—mighty Jupiter, and its moons Io (left) and Ganymede (right).
A crescent Moon seen during the day, arcing from upper left to lower right of the frame. At lower centre is the full disk of Jupiter; the small dots to its upper left and lower right and Io and Ganymede, respectively.
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The Art of Planetary Science @artofptys.bsky.social · 31/08/2026
TAPS is now on Bluesky! We are excited to announce that TAPS is back for 2027! Submissions are open now. TAPS 2027 will feature both data art and fine art with this year’s theme being “As We Float on By: 50 Golden Years of Voyager”
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BK? @whitesox.bsky.social · 27/08/2026
MLB posting a 9 minute compilation of right field assists to third base in honor of Dolly Parton. Because 9-5. Genius. youtu.be/IokVk0-XS8Y?...
youtu.be
Throwin' 9 to 5! 9:25 of the GREATEST assists from right fielders to third basemen | MLB Highlights
YouTube video by MLB
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Bob Pappalardo @rpappalardo.bsky.social · 25/08/2026
Europa Clipper's first in-flight science discovery paper: 17 spacecraft, led by Clipper's plasma experts, characterize a coronal mass ejection! www.space.com/astronomy/su...
space.com
How a huge fleet of 17 spacecraft discovered something surprising about solar eruptions
Taking measurements of the same CME from different vantage points in the solar system revealed the true extent of a solar eruption.
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Bob Pappalardo @rpappalardo.bsky.social · 13/07/2026
Please consider making a donation toward the production of this amazing film. Video preview is at this link and below. "Two Colombian girls defy barriers to chase astronomy dreams. NASA-bound, they prove education can transform lives!" seedandspark.com/fund/in-awe-...
seedandspark.com
In Awe of Stars (Niñas que miran las estrellas) - Film and Storytelling | Seed&Spark
Two Colombian girls defy barriers to chase astronomy dreams. NASA-bound, they prove education can transform lives. Your support will inspire others to dream big, pursue science, and believe in their a...
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Bob Pappalardo @rpappalardo.bsky.social · 08/07/2026
How could they not have accepted this one? #SpellingBee
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Bob Pappalardo @rpappalardo.bsky.social · 08/06/2026
The Europa Clipper team is in Boulder! lasp.colorado.edu/2026/06/08/c...
lasp.colorado.edu
CU Boulder hosts science team meeting for NASA mission enroute to icy moon of Jupiter
More than 200 scientists, engineers, and mission specialists from across the U.S. and around the world are gathering this week at the University of Colorado Boulder to discuss NASA’s Europa Clipper mi...
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Bob Pappalardo @rpappalardo.bsky.social · 17/05/2026
Hey #AbSciCon #AbSciCon2026! Look for me or @planetcynthia.bsky.social at the conference this week for a variety of rainbow swoosh pin styles, for your wearing pleasure.
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Bob Pappalardo @rpappalardo.bsky.social · 20/04/2026
“Dude. No. Way.” #Earthset #Artemis
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Baptiste Journaux @bjour.bsky.social · 08/04/2026
2026 space odyssey
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David Ho @davidho.bsky.social · 12/03/2026
The 2026 National Science Foundation budget is $8.75 Billion.
nytimes.com
First 6 Days of Iran War Cost U.S. $11.3 Billion, Pentagon Says
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Emily Lakdawalla 🏳️‍⚧️ Uranus Expert @elakdawalla.bsky.social · 04/03/2026
WTF is this and why didn't they want all the top talent they've been firing from NASA centers for the last couple of years www.nasa.gov/news-release...
nasa.gov
NASA, OPM Launch NASA Force to Recruit Top Talent for US Space Program - NASA
The U.S. Office of Personnel Management (OPM) and NASA announced NASA Force on Wednesday, a dedicated talent track within the US Tech Force initiative
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𝙽𝚊𝚜𝚑 𝙸𝚜 𝙷𝚎𝚛𝚎 𝙵𝚘𝚛 𝙸𝚝 @nashishereforit.bsky.social · 17/02/2026
Wow.
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Dave Itzkoff @ditzkoff.bsky.social · 11/02/2026
RIP Bud Cort. How else would you even pay tribute to him.
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Bob Pappalardo @rpappalardo.bsky.social · 29/01/2026
Mining of the Galileo infrared data suggests ammonia compounds at Europa! Nitrogen is a critical element for life as we know it. This provides additional fodder for the Europa Clipper mission, making the first of 49 Europa flybys on March 7, 2031! science.nasa.gov/blogs/scienc...
science.nasa.gov
NASA’s Galileo Mission Points to Ammonia at Europa, Recent Study Shows - NASA Science
New analysis of decades-old data has turned up a significant result: the first discovery of ammonia-bearing compounds on the surface of Jupiter’s moon Europa.
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Jeff Rueter @jeffrueter.bsky.social · 25/01/2026
Kare 11 local news just read, in full, this statement from Michael and Susan Pretti, the parents of Alex Pretti. "Please get the truth out about our son."
Statement from Michael and Susan Pretti
Parents of Alex Jeffrey Pretti

“We are heartbroken but also very angry.

Alex was a kindhearted soul who cared deeply for his family and friends and also the American veterans whom he cared for as an ICU nurse at the Minneapolis VA hospital. Alex wanted to make a difference in this world. Unfortunately, he will not be with us to see his impact.

I do not throw around the ‘hero’ term lightly. However, his last thought and act was to protect a woman. The sickening lies told about our son by the administration are reprehensible and disgusting. Alex is clearly not holding a gun when attacked by Trump’s murdering and cowardly ICE thugs. He had his phone in his right hand and his empty left hand is raised above his head while trying to protect the woman ICE just pushed down, all while being pepper sprayed. 

Please get the truth out about our son. He was a good man. Thank you.
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Adam Parkhomenko @adamparkhomenko.bsky.social · 13/01/2026
BREAKING: ICE agents in Minneapolis violently detained and arrested a U.S. citizen for one reason only: he refused to prove his citizenship. No crime. No warrant. No probable cause.
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Ana Marie Cox @anamariecox.com · 13/01/2026
Dear sweet Jesus, these photos from after they drag her away are even worse. (h/t @mprnews.org, doing the Lord's work). www.instagram.com/reel/DTdrPvZ...
instagram.com
MPR News on Instagram: "On Tuesday, Jan. 13, a woman in south Minneapolis was stopped by ICE, pulled from her car and carried by agents into their vehicle. As she was being carried the woman told agen...
3,476 likes, 207 comments - mprnews on January 13, 2026: "On Tuesday, Jan. 13, a woman in south Minneapolis was stopped by ICE, pulled from her car and carried by agents into their vehicle. As she was...
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amanda moore 🐢 @noturtlesoup17.bsky.social · 13/01/2026
Today at 34 & Park in Minneapolis, a woman tried to drive down the street where a protest had broken out in front of a home ICE was raiding, saying she had a doctor apt to get to. ICE agents busted out her windows, cut off her seatbelt, and pulled her out before arresting her.
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butterflygirl24 @butterflygirl24.bsky.social · 13/01/2026
Just like the Nazi Gestapo, they went door to door looking for Jews! #arrestice #minnesota
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Paul Byrne @theplanetaryguy.com · 09/01/2026
Planetary friends! Don't want to go to Houston in March, or support an institute that's bending the knee? Then join us for the very first Planetary Science Community Workshop in Louisville, KY on April 14–16, 2026. It's our community. Fight for it! Details at the link: planetaryworkshop.org
planetaryworkshop.org
PSCW 2026
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Chad Loder @chadloder.dev · 08/01/2026
Nothing so perfectly proves the concept of whiteness as a social construct than the reality that white people who stand up for minorities forfeit some of the protections that whiteness afforded them.
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Jackie Clark @geojackjack.bsky.social · 06/01/2026
Happy "Not Submitting an LPSC Abstract Today" to those who celebrate.
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Bob Pappalardo @rpappalardo.bsky.social · 30/12/2025
A career in a file drawer, succinct and color-coded. An office move, 21st Century reality and Mabel’s urging combined to convince me to retain just several hardcopies of each publication (with placeholders for many not yet printed). An adjacent empty drawer awaits Europa Clipper’s scientific bounty.
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Paul Byrne @theplanetaryguy.com · 17/12/2025
🚨 SAVE THE DATE 🚨 We're putting together a Planetary Science Community Meeting at the Kentucky Science Center in Louisville, KY on April 14–16 2026. This is a grass-roots meeting for planetary scientists to gather, discuss, and organize to address pressing issues our community faces. (1/2)
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Bob Pappalardo @rpappalardo.bsky.social · 23/12/2025
Happy Holidays from Europa Clipper!
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Jasmine 🌌🔭 @astrojaz.bsky.social · 18/12/2025
OUR CLIPPER PRESS RELEASE FOR COMET 3I/ATLAS IS OUT 🥹 i can’t even begin to describe what it feels like to be looking at new and exciting data with europa clipper. it’s a dream come true 😭 www.swri.org/newsroom/pre...
swri.org
Europa Clipper instrument uniquely observed interstellar comet 3I/ATLAS | Southwest Research Institute
SwRI-led Ultraviolet Spectrograph viewed 3I/ATLAS both when and where most other assets could not
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Bob Pappalardo @rpappalardo.bsky.social · 18/12/2025
Europa Clipper has observed interstellar comet 3I/ATLAS with its ultraviolet spectrograph instrument! News here: www.swri.org/newsroom/pre...
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Bob Pappalardo @rpappalardo.bsky.social · 15/12/2025
Chris Glein delivers an informative and inspiring Sagan Lecture on ocean worlds as potential abodes of life at #agu25.
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Bob Pappalardo @rpappalardo.bsky.social · 04/12/2025
The ESA Juice mission observed interstellar comet 3I/ATLAS! www.esa.int/ESA_Multimed...
esa.int
Comet 3I/ATLAS shows activity in Juice navigation camera teaser
Comet 3I/ATLAS shows activity in Juice navigation camera teaser
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Bob Pappalardo @rpappalardo.bsky.social · 02/12/2025
Might the surface of Europa hint at subsurface brines? www.ucf.edu/news/ucf-stu...
ucf.edu
UCF Study Explores Formation of Spider-Like Features on Jupiter’s Moon Europa and Potential for Life
UCF Physics Professor Lauren McKeown and colleagues are studying a spider-like formation on Jupiter’s icy moon Europa to understand how it formed and what it reveals about subsurface brine pools and p...
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Bob Pappalardo @rpappalardo.bsky.social · 26/11/2025
Goodnight Moon. #dtla #moonset
A crescent moon glows orange as it sets over a hill, aside the glow of Downtown Los Angeles, viewed from afar.
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Jasmine 🌌🔭 @astrojaz.bsky.social · 21/11/2025
it’s SO exciting to see images from a spacecraft you work on, even if they’re just test images 🥹 this is a starfield image from europa clipper, including the planet uranus! it was taken to test clipper’s star-tracking cameras!!
An annotated version of the image with Uranus and several background stars labeled.
NASA/JPL-Caltech
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David Grinspoon @drfunkyspoon.bsky.social · 08/11/2025
WOW! An incredible discovery. The first ever image of a baby exoplanet embedded in the dust rings from which planets are forming around a star. Confirms the developing view of planet formation that we’ve never before seen in action. 🧪🔭 www.universiteitleiden.nl/en/news/2025...
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Bob Pappalardo @rpappalardo.bsky.social · 05/11/2025
Moonrise.
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Daniel Swain @weatherwest.bsky.social · 30/10/2025
I wanted to offer some thoughts on the Gates climate memo that has been circulating this week. While I can't directly speak for others, I can say that my own response is one of dismay & deep frustration (and that this view is shared by many climate/Earth scientists). [1/n]
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Bob Pappalardo @rpappalardo.bsky.social · 26/10/2025
Amazing!
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Bob Pappalardo @rpappalardo.bsky.social · 14/10/2025
A dark day is coming.
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ESA Operations @operations.esa.int · 01/09/2025
Flyby success! ESA's Juice spacecraft passed Venus at 07:28 CEST on 31 August. This photo shows our deep-space antenna in Spain in communication with Juice during the flyby. Juice’s current location, Venus, and its destination, Jupiter, are both visible in the sky ❤️
Photo of ESA deep space antenna in Spain with Venus and Jupiter labelled in the night sky
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Jean-Luc Margot @jeanlucmargot.bsky.social · 31/08/2025
“They’re afraid that basic knowledge will expose their false claims.” www.nytimes.com/2025/08/31/s...
nytimes.com
Historians See Autocratic Playbook in Trump’s Attacks on Science
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Daniel Pomarède @pomarede.bsky.social · 23/08/2025
SPHEREx Discovers Extended Carbon Dioxide Coma in Interstellar Object 3I-ATLAS spherex.caltech.edu/news/3i-atla... #SPHEREx #3IATLAS 🧪🔭
SPHEREx discovered a bright CO2 coma (the extended gaseous atmosphere of a comet) surrounding 3I/ATLAS. It extends out to at least 348,000 km. Credit: NASA/JPL-Caltech.
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Alejandro Soto @soto.space · 19/08/2025
Maryame El Moutamid and colleagues have discovered a new moon orbiting Uranus. The JWST observations show a 10km moon orbiting 56,000km from Uranus's center. This moon adds to the complex puzzle that is the Uranian ring and moon system. #planetsci 🧪 science.nasa.gov/blogs/webb/2...
science.nasa.gov
New Moon Discovered Orbiting Uranus Using NASA’s Webb Telescope - NASA Science
Using NASA’s James Webb Space Telescope, a team led by the Southwest Research Institute (SwRI) has identified a previously unknown moon orbiting Uranus,
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Steve Desch @deschscoveries.bsky.social · 08/08/2025
I have a complaint about Avi Loeb's latest work and I want to speak to management. medium.com/@steve.desch...
medium.com
This is not the quality of pseudoscience infotainment to which I have grown accustomed
Teasing the public with fraudulent or self-deluded promises of aliens used to mean something. It took work. It meant slapping together…
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Lynn Carter @lynncarter.bsky.social · 01/08/2025
The REASON Ice Penetrating Radar produced good test data when we flew by Mars! All looking good for seeing inside #Europa in a few years. www.nasa.gov/missions/eur...
nasa.gov
NASA’s Europa Clipper Radar Instrument Proves Itself at Mars - NASA
The agency’s largest interplanetary probe tested its radar during a Mars flyby. The results include a detailed image and bode well for the mission at
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Bob Pappalardo @rpappalardo.bsky.social · 01/08/2025
Maaaaarrrrssss! #EuropaClipper www.nasa.gov/missions/eur...
nasa.gov
NASA’s Europa Clipper Radar Instrument Proves Itself at Mars - NASA
The agency’s largest interplanetary probe tested its radar during a Mars flyby. The results include a detailed image and bode well for the mission at
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Robert Reich @rbreich.bsky.social · 10/07/2025
The first time Charlie Chaplin used his voice in a film, he wielded it to forcefully condemn the rising forces of fascism around the globe. Will we listen to his words today?
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