Space Domain Awareness @shell_jim
Space surveillance, SSA/SDA, orbital debris expert. Retired USAF with 30+ years of space experience. Physics (M.S.) and Imaging Science (PhD). USAFA '92. linkedin.com/pub/jim-shell/… Joined February 2012-
Tweets2K
-
Followers1K
-
Following253
-
Likes5K
Atlas V Centaur upper stage breakup - one year later US catalog object 43227 (2018-022B) More than 1000 unique objects tracked, but none cataloged on space-track.org open.substack.com/pub/spacedomai…
1
8
18
2K
4
Download Image
Space Domain Awareness retweeted
What if all those PhDs stop just defending and actually start attacking?!?
A disturbing new development. It appears China is tracking commercial satellites the US is NOT tracking, and furthermore provided orbit information to the owner operators. Sure, it's a benign ~100 gram satellite, but the precedent is unsettling. Article here ->…
*** Commercial Space Tug with 16U Cubesat Likely NOT to Return to GEO from xGEO *** It appears that Chimera GEO-1 (63100 / 2025-038B) will likely NOT make an unsuspecting appearance in geosynchronous orbit Substack article here: spacedomain.substack.com/p/cubesat-slat…
An update on the accelerated placement of PRC upper stages in long-lived high altitude LEO orbits. This population is on the verge of an exponential increase given China's standard practice for mega constellation launches. spacedomain.substack.com/p/mega-mess-ro…
I🛰️ *** Geosynchronous cat & mouse - large maneuver by China's SJ-25/SJ-21 likely targeting satellites from the US USSF-44 launch *** The fascinating element in this are the numerous objects (16) associated with the USSF-44 launch and the varied levels of public disclosure by…
Space Domain Awareness retweeted
Jonathan's Space Library will be moving to Bromley, south of London, at end 2025. Still to do: - Complete purchase of property - Planning approval for renovation - Construction, and shipping! gofundme.com/f/fund-jonatha… Funds still needed
Jonathan McDowell @planet4589
166K Followers 5K Following Astronomer commenting on space launches. Orbital Police. Personal account. All plots CC-BY. @planet4589 on Ma, bsky, etc.
Scott Tilley 🇺🇦... @coastal8049
23K Followers 402 Following
brianweeden @brianweeden
10K Followers 1K Following Space policy wonk, computer nerd, amateur chef, proud father and husband. Mainly at https://t.co/nx3Zcoq4MB or https://t.co/uJ4fMMfsRk
Andrew Jones @AJ_FI
37K Followers 3K Following Journalist tracking China's space programme. Correspondent at @SpaceNews_Inc; @SPACEdotcom @exploreplanets @IEEESpectrum
Victoria Samson @VSamson_DC
3K Followers 2K Following Hates the humidity, loves cats. Works on space policy for @SWFoundation, but opinions are mine, not the organization's. She/her
Dr Marco Langbroek @Marco_Langbroek
22K Followers 977 Following Lecturer optical Space Situational Awareness @AETUDelft. Spy sats, missiles, meteorites, asteroids. Asteroid (183294). Former archaeologist. Opinions my own
DutchSpace @DutchSpace
14K Followers 508 Following Multipurpose spacecraft wrangler for @ESA Opinions my own.
Gunter Krebs 🚀 �... @Skyrocket71
4K Followers 1K Following Spaceflight Historian & Analyst, Nerd, Physicist and Editor of Gunter's Space Page (https://t.co/dEIzsX3s6C) - also to be found on @[email protected]
Cosmic Penguin @Cosmic_Penguin
11K Followers 6K Following Astronomy & spaceflight weeb penguin. In a relationship w/ Space Shuttle Discovery. Starship x @NASA_SLS shipper. Chinese spaceflight news/@PRCMarsRover hunter.
S4S_SDA @S4S_SDA
21K Followers 91 Following Follow us for public space domain awareness events and info posted to https://t.co/obKjbNWrEw, U.S. Space Command’s public website for sharing orbital data.
Todd Master @MasterActual
4K Followers 1K Following COO @umbraspace doing face melting SAR and mind bending space systems.
Moriba Jah @moribajah
5K Followers 276 Following CorrFellow @RoyalSocEd, @MacFound, @TEDFellow, Space Environmentalist, Professor @UTAustin, Co-Founder & Chief Scientist @PrivateerSpace T/RT are my own
SatNOGS @SatNOGS
11K Followers 372 Following A global satellite ground station network. Built as an open source project, run by volunteers around the world. Supported by @LibreSpace_Fnd. Join us!
A.C. Charania @ac_charania
7K Followers 6K Following Current: @zeno_power | @balerionspace - Prior: @NASA @reliable_robot @blueorigin @virgingalactic @generationorbit @SpaceWorksSEI @gtssdl. My tweets my own.
Tom Johnson @tj_astro
443 Followers 585 Following Space nerd, orbit determination, space situational awareness, and data visualization. Occasional digital signal processing.
stromgade @stromgade
2K Followers 405 Following News about Earth Observation. Author of https://t.co/Whdgzt5wES and https://t.co/E5OkTBcEIH @stromgade .bsky.social Opinions my own
COMSPOC Corp. @COMSPOC
1K Followers 528 Following Supporting the space operations community with software products and services that address current and emerging challenges in the space environment. 🌎🛰️
marsboy @marsboy
1K Followers 384 Following Leonard David is a writer/journalist covering the world's space activities for over 50 years.
jobb_jobb @jobb_jobb_jobb
8 Followers 254 Following
Nat Mc @Natmacrr
54 Followers 984 Following
Li_F2_H2 @Li_F2_H2
27 Followers 1K Following
Justin Miles @Celcius_222
501 Followers 3K Following Satellite engineer, locksport, 3d printing, shellback, Army stuff (SFOR and OEF) ages ago. Expat/Immigrant. #NAFO https://t.co/6PuXyTeI93
Gianluca Stefanelli @GianlucaSt15137
1 Followers 56 Following
cookingwong @CookingWong
2K Followers 566 Following now I sell spacebooms and hypersonic armor. maybe MasterChef, bb/acc, angel checks. I'm probably thinking about it
Domainer.Team @DomainerTeam
5 Followers 116 Following #DomainerTeam #TopNotch #Domain #DomainsForSale #PremiumDomain #Brand #Startup #Biz #ForSale #BuyNow #MakeOffer 👉 DM If You Need Any Domain.
Cristián Morales @Cris_Morales_CR
78 Followers 409 Following BioSystems Engineering Student.🧑🔬🌱🌦️ #timelapse
Shira sarah @SarahShira49066
98 Followers 1K Following A sound mind and good health. listening to music, playing games, and reading.
Joe @Joe541342433361
0 Followers 12 Following
Sylvia🌸 @amadoufranci7
386 Followers 7K Following Living life to the fullest ✨Embracing every moment & chasing dreams 🌟 Thriving with wisdom & grace 🌸 Celebrating life one day at a time 🌈
Edith @mRicaRJD
267 Followers 189 Following With steady steps and a clear heart, life begins to shine softly and surely🇺🇸🇺🇸
Kat @X4Kat
0 Followers 249 Following
Sophia (Yasemin) @GeorgeAFinley
664 Followers 4K Following I love skiing🏂, diving🏊♂️, and painting🎨. Making new friends is my joy! I love America🇺🇸 and look forward to sharing exciting moments!🌟
Lauren Mitchell @LMitchell_la
684 Followers 452 Following Planner 🌸 | Use colors ✨ & creativity 💡 to tell stories 📚 and bring art into daily life 🌷
Irnadee @Irnadee2518
122 Followers 2K Following
Laura Cummings @SpatialistAtLaw
739 Followers 755 Following Space law 🚀 Regulatory Affairs Counsel @Astroscale_US; J.D. ‘21 from @GeorgetownLaw; BAs in Astronomy & IAFS from @CUBoulder (all views expressed are my own)
Caden Dennis @CadenDennis
38 Followers 154 Following
ppp @ppp518008736187
16 Followers 621 Following
John Basham @JohnBasham
102K Followers 4K Following Meteorologist, AI, Data Scientist, @USArmy Ret, #IC, Fmr TX Elected Official. Seen @AmThoughtLeader Heard @SeanHannity, @FBI Target #TwitterFiles For Censorship
Doug Brake @dmbrake
2K Followers 2K Following I like nature and good clean, licensed spectrum. CTIA policy communications | formerly NTIA, ITIF "our best machines are made of sunshine"
PJ Wang @PJWang12
1K Followers 4K Following London Psychiatry Doctor. Imperial College London BMA Council, UKRDC 2022-2026 Royal College of Psychiatrists RDC Vice-chair 2025-2026 #BMA #FullPayRestoration
DanielAustin @UniersalWalker
81 Followers 894 Following
Enplox @Enplox
19 Followers 1K Following
Patrick Fitzgerald @fitz42_patrick
13 Followers 177 Following
Egemen İmre @uyducusirin
20K Followers 890 Following Uydu uzay işleri, duruma göre veri/bilgi güvenliği, 'digital privacy' filan. Bir de açık kaynak yazılım elbette... Yazdıklarım kişisel görüşlerimden ibarettir.
Metal08 @metal00008
465 Followers 1K Following Realist & nationalist 🇮🇳 Defence enthusiast Interested in defence, space, Geopolitics, Tech
nah @nah_actual
9 Followers 1K Following Graduate student. Defense & Strategic Studies. Interests: cyberspace, deterrence, denial, nuclear weapons.
fox 3 @BravoZulu999
51 Followers 466 Following looking through AN /APG 81. retweets doesn't mean full endorsement
demographic realist @VasilekEnjoyer
62 Followers 245 Following indirect fire enthusiast, autel #1 investor, stockpilemaxxing. nothing ever happens except when it does
Spartacus @OrbitHypersonic
57 Followers 281 Following
WebChat.CLUB @WebChatCLUB
26 Followers 538 Following Hello World ! Welcome to https://t.co/iKXZLy7NUk https://t.co/Dymisgbl0p
Domains Galleria @Domain_Galleria
112 Followers 938 Following #Domain #DomainsForSale #PremiumDomain #Brand #Startup #Biz #ForSale #BuyNow #MakeOffer 👉 DM If You Need Any Domain.
Domains For Sale @BuyNowDomains
1K Followers 921 Following ➤ #Domain ➤ #DomainsForSale ➤ #MakeOffer #Business #Brand #Startup #BusinessForSale #Biz #ForSale #PremiumDomain
Bruno @BrunoOss__
184 Followers 2K Following a dúvida é o atalho pra inteligência, sem a dúvida não há mais o que aprender.
Cristina Pereira @CrisGFPereira
2K Followers 4K Following I'm the official author of the album Passion Poems on Youtube @ trinityfast. My gratitude to @elonmusk for X & 4Everything he've been doing 2 help Humanity!
Steven11 @StevenMiona
2 Followers 32 Following
Jeremy Maxie @jeremy_maxie
3K Followers 6K Following Energy, Geopolitics, Strategy, Conservative Realism. Book project USMC COIN in Vietnam War. Midwest w/Appalachian Scots-Irish roots, prior USMC.
Jonathan McDowell @planet4589
166K Followers 5K Following Astronomer commenting on space launches. Orbital Police. Personal account. All plots CC-BY. @planet4589 on Ma, bsky, etc.
Scott Tilley 🇺🇦... @coastal8049
23K Followers 402 Following
brianweeden @brianweeden
10K Followers 1K Following Space policy wonk, computer nerd, amateur chef, proud father and husband. Mainly at https://t.co/nx3Zcoq4MB or https://t.co/uJ4fMMfsRk
Jeff Foust @jeff_foust
100K Followers 1K Following Senior writer, @SpaceNews_Inc. Tips? DMs open, email [email protected], or on Signal: jfoust.58. Also @jfoust.bsky.social.
T.S. Kelso @TSKelso
9K Followers 20 Following Operator of CelesTrak, the world's first source for orbital element sets and related software and educational materials.
Andrew Jones @AJ_FI
37K Followers 3K Following Journalist tracking China's space programme. Correspondent at @SpaceNews_Inc; @SPACEdotcom @exploreplanets @IEEESpectrum
Dr Marco Langbroek @Marco_Langbroek
22K Followers 977 Following Lecturer optical Space Situational Awareness @AETUDelft. Spy sats, missiles, meteorites, asteroids. Asteroid (183294). Former archaeologist. Opinions my own
Aaron Bateman @aaronbateman22
9K Followers 475 Following Assist. prof @GWTweets | book#1: Weapons in Space | Book#2 Wiring an Empire: Information Networks & US Global Power in the Cold War (contracted w/ MIT Press)
John Kraus @johnkrausphotos
324K Followers 697 Following Photographer sharing the most exciting moments from this great new era in spaceflight
Gunter Krebs 🚀 �... @Skyrocket71
4K Followers 1K Following Spaceflight Historian & Analyst, Nerd, Physicist and Editor of Gunter's Space Page (https://t.co/dEIzsX3s6C) - also to be found on @[email protected]
NSF - NASASpaceflight... @NASASpaceflight
677K Followers 326 Following Official Account of NSF. News, videos, and community for spaceflight enthusiasts since 2005. NSF is not affiliated with NASA, initials used with permission.
Cosmic Penguin @Cosmic_Penguin
11K Followers 6K Following Astronomy & spaceflight weeb penguin. In a relationship w/ Space Shuttle Discovery. Starship x @NASA_SLS shipper. Chinese spaceflight news/@PRCMarsRover hunter.
SPACE.com @SPACEdotcom
1.6M Followers 943 Following The premier source of space exploration, innovation, and astronomy news. Part of @futureplc
S4S_SDA @S4S_SDA
21K Followers 91 Following Follow us for public space domain awareness events and info posted to https://t.co/obKjbNWrEw, U.S. Space Command’s public website for sharing orbital data.
Anatoly Zak @RussianSpaceWeb
24K Followers 295 Following Author of Russia in Space; journalist, illustrator. Clients: Popular Mechanics, Aviation Week, Air & Space Smithsonian, Aerospace America & others.
SpaceNews @SpaceNews_Inc
134K Followers 277 Following Since 1989, SpaceNews has set the authoritative standard for independent space journalism. Subscribe to our newsletters: https://t.co/OurpSOmMeN
Marcia Smith @SpcPlcyOnline
24K Followers 437 Following http://t.co/h6g8Y4OLgo provides news and analysis about U.S. and foreign civil, commercial, and military space programs. Its editor is Marcia Smith.
Todd Master @MasterActual
4K Followers 1K Following COO @umbraspace doing face melting SAR and mind bending space systems.
Lukas C. H. @GewoonLukas_
2K Followers 380 Following Spaceflight Enthusiast 🚀 Mission Patches 🎨 → https://t.co/EkMLPky1c1 May the force be with you my friend, Ad Astra Per Aspera ✨️🕊
Lue Elizondo @LueElizondo
247K Followers 203 Following Former Director of AATIP, Disclosure and Transparency Advocate, Author, Husband and Father, Proud Veteran
Christopher K. Mellon @ChrisKMellon
153K Followers 46 Following Former Deputy Assistant Secretary of Defense for Intelligence | Former Minority Staff Director, Senate Select Committee on Intelligence
Project Kuiper @ProjectKuiper
8K Followers 15 Following Project Kuiper is a low Earth orbit (LEO) satellite constellation that will provide fast, affordable broadband to unserved and underserved communities.
Bill Gray @Bill_J_Gray
16 Followers 1 Following plütó@ṕrôjëçtpłuto.cȯm (remove diacritics if you're not a spammer). E-mail will work; Tw__ter may not.
Ignacio Belieres Mont... @ignaciobelieres
601 Followers 497 Following CEO & founder @epicaerospace - building the physical layer to an internet of satellites.
Dr. John Barentine FR... @JohnBarentine
5K Followers 2K Following Astronomer. Historian. Arizona native. Proud LGBT American. 🏳️🌈 Retiring to asteroid 14505. @[email protected]
Albedo @Albedo
3K Followers 75 Following Building high-performance spacecraft for the new frontier of VLEO. Launched Clarity-1 in March 2025. Delivering exquisite imagery soon.
EPIC AEROSPACE @epicaerospace
1K Followers 23 Following
COMSPOC_OPS @COMSPOC_OPS
790 Followers 121 Following COMSPOC Operations Team | Technical experts in orbital analysis, maneuver detection, and near real-time space tracking | Advancing Space Domain Awareness.
(((James Acton))) @james_acton32
24K Followers 636 Following Co-director, @carnegienpp and senior fellow, @CarnegieEndow; nuclear policy, national security & politics; occasional agonizing about @Nationals; RT≠E etc.
🏳️🌈Alejand... @Alexphysics13
9K Followers 348 Following Writer and livestream commentator at @NASASpaceflight. My opinions are my own and my own only, if you don't like them, look/go away. ES/EN He/Him 🏳️🌈⭐️
Almudena Azcárate Or... @almuazcarate
1K Followers 630 Following I do space security research @UNIDIR 🇺🇳 | Doctor in Space Security Law @GeorgetownLaw 🛰️ | Fellow @GtownNatSec 🚀 | Opinions are my own
stromgade @stromgade
2K Followers 405 Following News about Earth Observation. Author of https://t.co/Whdgzt5wES and https://t.co/E5OkTBcEIH @stromgade .bsky.social Opinions my own
ULA @ulalaunch
374K Followers 1K Following Wherever the mission takes us. Our rockets fly to the most challenging orbits, while delivering the most accurate payload insertions in the world.
Slingshot Aerospace @sling_shot_aero
3K Followers 424 Following Space operators around the world turn to Slingshot's industry-leading AI, data, and insights to support mission-critical training, planning, and operations.
CAS Space @cas_space
2K Followers 118 Following Dedicated to providing top-tier commercial launch vehicles, technologies and services for the global community.
SomeAstroStuff @someastrostuff
203 Followers 41 Following
Matt Shouppe @MattShouppe
704 Followers 543 Following
NOAA Office of Space ... @CommerceinSpace
2K Followers 119 Following @CommerceGov @NOAA Office of Space Commerce. Working hard to promote a robust and responsive U.S. industry that is the world leader in space commerce.
PLATracker @PLATracker
8K Followers 116 Following Monitoring Chinese military activity and regional security developments in the Indo-Pacific.
s2a systems @s2a_systems
2K Followers 115 Following Developing and operating systems for Space Situational Awareness.
Chinese Space Station @CNSpaceStation
23K Followers 408 Following As China's 1st permanent space station, CSS will become a crucial platform for int'l space coop & contribute to space exploration for all humankind.
Space TFRs @SpaceTfrs
7K Followers 17 Following I tweeted new SPACE OPERATION temporary flight restrictions posted by the FAA. @[email protected]
FCC Space Licenses @FccSpace
6K Followers 4 Following I tweeted notice of any FCC applications for space vehicles
NOTAMs for Space 🚀 @NotamUpdates
3K Followers 42 Following A notice to airmen (NOTAM) is a notice to alert aircraft pilots of potential hazards along a flight route. I tweet those that could be a spaceflight.
CelesTrak by Dr. T.S.... @CelesTrak
2K Followers 131 Following Created by Dr. T.S. Kelso in 1985 with the focus on satellites and astronomy. Now CelesTrak is a 501(c)(3) providing timely and highly accurate orbital data
Space Development Age... @SemperCitiusSDA
4K Followers 52 Following Space Development Agency, U.S. Department of Defense. Engagement is not endorsement.
Commercial Space Fede... @csf_space
10K Followers 285 Following The leading voice for the commercial spaceflight industry, laying the foundation for a sustainable space economy and democratizing access to space.
Jessica West, PhD she... @JessicaWestPhD
2K Followers 2K Following Exploring peace, security, and space with a critical eye and a human touch. Associated with @ploughshares_ca, @GrebelCPA, @CIGIonline, Canadian Pugwash Group
Will Crowe @drwillcrowe
147 Followers 26 Following CEO and co-founder of @heospace 📷 using satellites to look at stuff in space (#noUFOpolicy) 🛸 ad asteroid etc. ☄️DM to join our supplier program 🛰
Digantara @Digantarahq
6K Followers 2 Following Mastering Space Intelligence. Securing Orbits. Navigating the Future.
Share My Space @sharemyspacee
336 Followers 79 Following French start-up founded in 2017 operating in the #SSA market, active in the tracking of artificial satellites and space debris.
Jess Lis 🛰 @jessicaxlis
1K Followers 551 Following Building the future of in orbit servicing & space sustainability @astroscale_UK // Formerly @payloadspace
Metrea @MetreaAero
291 Followers 129 Following We provide solutions to the toughest problems in national security. Adaptation, Accelerated.
Massimo @Rainmaker1973
3.3M Followers 150 Following Engineer. Selecting and curating pictures and videos trying to awaken your sense of wonder. Science, tech, art, weather, space, the unusual around us.
U.S. Air Force @usairforce
1.7M Followers 644 Following Official U.S. Air Force X: The appearance of hyperlinks does not = endorsement. Comment moderation & endorsement disclaimer: https://t.co/ueEIVwJZNh
SpacePolicyInstitute @Space_Policy
652 Followers 87 Following SPI focuses its activities on policy issues related to the space efforts of the US and interactions in space with other countries.Trends for United States
167 B posts
73,4 B posts
140 B posts
55,4 B posts
364 B posts
31,4 B posts
25,6 B posts
18,6 B posts
136 B posts
12,5 B posts
10,4 B posts
25,7 B posts
1.793 posts
13,8 B posts
13,1 B posts
7.540 posts
26,7 B posts
53,4 B posts
You might like
ExoAnalytic Solutions
@exoanalytic
874 Followers
AMOS Conference
@amoscon
1K Followers
Secure World Foundati...
@SWFoundation
5K Followers
COMSPOC Corp.
@COMSPOC
1K Followers
Christopher Johnson
@ChrisJohnsonEsq
5K Followers
brianweeden
@brianweeden
10K Followers
Gunter Krebs 🚀 �...
@Skyrocket71
4K Followers
Car_Ramrod
@CanuckUFOguy
1K Followers
Joseph Burkes
@Noah18jojo
1K Followers
George Sowers
@george_sowers
5K Followers
Nick Shave
@NickShave12
454 Followers
jmarieali
@jmarieali
627 Followers
TicTac Pilots
@TictacPilots
3K Followers
Theresa Hitchens
@Genevaexpat
2K Followers
UFO / UAP First Conta...
@UAPFirstContact
508 Followers