Sdi
Barack Obama
This account is run by #Obama2012 campaign staff. Tweets from the President are signed -bo.16,011,897 followers | Follow
UK Prime Minister
The official twitter channel for Prime Minister David Cameron's office, based at 10 Downing Street. Twitter policy: http://www.number10.gov.uk/number10online/1,999,366 followers | Follow
Asteroid Watch
JPL's Near Earth Object Office coordinates NASA's efforts to detect, track & characterize potentially hazardous asteroids & comets that could approach Earth.873,412 followers | Follow
googleearth
70,348 followers | Follow
Bob Richards
Space entrepreneur. Orphan of Apollo. A Founder of the International Space University, Singularity University, SEDS, Odyssey Moon & Moon Express (CEO).37,985 followers | Follow
NASAEyesOnTheEarth
Being rocket scientists isn't enough...we're climate scientists too! News from NASA on all things climate.37,965 followers | Follow
Danger Room
Noah Shachtman, Spencer Ackerman, and WIRED's national security dorks.34,790 followers | Follow
UN Peacekeeping
The official twitter account of United Nations Peacekeeping.25,948 followers | Follow
Earth Observatory
NASA images, stories, and discoveries about climate and the environment.22,612 followers | Follow
Space Fellowship
An international news and information network dedicated to the space industry.22,170 followers | Follow
NASA Watch
Covering NASA online since 1996. We're the source for NASA news.17,496 followers | Follow
Boeing Defense
Boeing Defense, Space & Security provides technologies that connect and protect, from the battlespace to outer space to cyberspace.16,194 followers | Follow
Defense News
Procurement and policy news for defense decisionmakers in the military, government, and industry. Feed maintained by Dave Brown, managing editor.14,549 followers | Follow
RAND Corporation
The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis.12,356 followers | Follow
UK Space Agency
The official Twitter account of the UK Space Agency. The Agency is at the heart of UK efforts to explore and benefit from space.12,115 followers | Follow
AF Space Command
Official Air Force Space Command Twitter: Stay up to date on all things AF Space!11,080 followers | Follow
Spacevidcast
Making Space Commonplace! New media company looking to the stars.9,950 followers | Follow
Geospatial News
Geospatial news, articles, events, and jobs relating to GIS, maps, cartography, and geography, from Caitlin Dempsey, editor of GIS Lounge.9,371 followers | Follow
Space Weather
We keep tabs on the space environment around the Earth as it is disturbed by the variable output of particles & radiation from the Sun. A service of @SpaceRef.8,140 followers | Follow
Google Sightseeing
All the funniest sights on Google #streetview and #googlemaps brought to you by @jturnbull and @alexturnbull.7,918 followers | Follow
Concerned Scientists
The Union of Concerned Scientists is the leading science-based nonprofit working for a healthy environment & safer world. I'm Katy, I handle social media at UCS7,820 followers | Follow
Asteroids and Comets
Reports asteroids and comets closest approaches to earth7,064 followers | Follow
Crisis Mappers
International Network of Crisis Mappers (CM*Net): www.CrisisMappers.net6,231 followers | Follow
The GIS Forum
The GIS forum twitter feed will be used to aggregate site posts and provide some quick site updates. It is monitored, but will probably not be very 'personal'.5,736 followers | Follow
US_STRATCOM
Leaders in Strategic Deterrence and Preeminent Global Warfighters in Space and Cyberspace5,660 followers | Follow
Andrew Erickson
China's rapid development is reshaping the world in all dimensions. Chinese language open sources offer insights into these critical trends.5,356 followers | Follow
Space Update
4,967 followers | Follow
Lewis Shepherd
Live in Virginia, work in DC and Redmond, play on the web. Director of Microsoft Institute for Advanced Technology in Governments.4,751 followers | Follow
Space News Intl.
A weekly international newspaper for the global space community.4,503 followers | Follow
NatlSecurityArchive
The National Security Archive, an independent research institution that advocates for government openness and uses FOIA to publish declassified documents4,249 followers | Follow
Space Launch News
Real time #space news coverage of world launches & missions from Cape Canaveral. #NASA #ESA3,504 followers | Follow
Stimson Center
The Stimson Center is a nonprofit, nonpartisan think tank dedicated to enhancing international peace and security.3,462 followers | Follow
Jeffrey Lewis
Director of the East Asia Nonproliferation Program at the James Martin Center for Nonproliferation Studies.3,350 followers | Follow
Directions Magazine
Feed for new articles and our newsletter from the magazine for All Things Location (GIS, LBS, GPS, geospatial, mapping and Location Intelligence)3,251 followers | Follow
Daniel Marín
Astrofísico entusiasta de la exploración espacial, la ciencia ficción y los idiomas. Autor del blog Eureka. @NASAJuno Tweetup and ESA 1st @Spacetweetup attendee3,235 followers | Follow
Bing Maps Developer
News and info for Bing Maps (formerly Virtual Earth) - John O'Brien MVP3,019 followers | Follow
GeospatialDiscussion
A website dedicated to the Geospatial Realm with emphasis being placed on GIS, Remote Sensing, and GPS.2,976 followers | Follow
Chuck Thornton
international security; cooperative threat reduction; nuclear weapons non/counter/anti-proliferation; Russia; human terrain analysis.2,959 followers | Follow
George Mapp
Dobroyeutro News Network ~ News on intelligence, CIA, drones, spies & counter-terrorism. Appearance of a link is not necessarily an endorsement.2,878 followers | Follow
SkyShare Network
Small field astronomy: planets, double stars, variables, exoplanets, planetary nebulae ... Love'em all2,288 followers | Follow
Andrew Elwell
Editor for Defence IQ. Follow for commentary, analysis and updates on global defence and military topics http://www.defenceiq.com2,102 followers | Follow
Marc Boucher
CEO at @SpaceRef a new media company focused on the space sector. Entrepreneur, technologist, publisher of @SpaceQuarterly magazine & online since '91.2,059 followers | Follow
Global_Security
2,021 followers | Follow
The Intelligence War
Discussing Intelligence and National Security. Independent views and analysis. RT/follow/link not necessarily an endorsement.1,749 followers | Follow
Space Agenda
The coming events related to Space, Astronomy, Aeronautics and many more. It's time for space!1,718 followers | Follow
defenceredbox
Defence Red Box brings you defence and security information from media around the world. See also Defence Viewpoints http://www.defenceviewpoints.co.uk1,678 followers | Follow
Space Frontier
People dedicated to opening the space frontier to human settlement by advancing #NewSpace. Our advocates listed at http://twitter.com/#!/SpaceFrontier/advocates1,651 followers | Follow
got geoint?
got geoint? is the official blog of the United States Geospatial Intelligence Foundation (USGIF)1,554 followers | Follow
ISN Zurich
The International Relations and Security Network (ISN) is an open access information service for IR and security professionals. RT ≠ endorsement.1,505 followers | Follow
SatToday editors
Your Portal to Global Communications Intelligence with SatelliteTODAY.com editor Jeffrey Hill.1,450 followers | Follow
Mobile Map Reporting
Mobile or Tablet based reporting tool. Create custom forms, add to image & send to Map in Real Time. Surveyor or Engineer? You really need to see a demo.1,431 followers | Follow
SpaceRef Canada
The leading source for news on Canada's space efforts covering the Canadian Space Agency, industry, academia, defence, space policy, exploration and more.1,377 followers | Follow
Chandrayaan1
I am India's first mission to the moon. This is the unofficial twitter feed.1,350 followers | Follow
Harri Ohra-aho
Brigadier General, Finnish Defence Forces Chief of Warfighting Integration and CIO. Interested in global security, cyberdomain, leadership and good music.1,349 followers | Follow
Pavel Podvig
1,095 followers | Follow
Lars Olberg
The Missile Monitor covers news on the proliferation and technology of missiles and missile defense systems.1,094 followers | Follow
Mrs. Smith
News, #OSINT, #RUMINT, My Own Unsolicited Opinions: Missile Defense; Nuclear Triad, Drone Warfare, Military Space, NatSec; RT/mention/follow ≠ endorsement1,091 followers | Follow
T.S. Kelso
Operator of CelesTrak, the world's first source for orbital element sets and related software and educational materials.931 followers | Follow
India Space
Covering the space activities of India. A service from @SpaceRef.889 followers | Follow
Missile Defense AA
Missile Defense Advocacy Alliance is a non-profit that seeks support for testing, development & deployment of missile defense systems to protect the US & Allies880 followers | Follow
Space Daily News
Space research and NASA news from SciGuru.com, a science and technology news source. Post the space news on your favorite sites such as Digg or own website.865 followers | Follow
Imaging Notes
Imaging Notes is objective reporting about how remote sensing and spatial technologies illuminate issues of the environment, energy and security.784 followers | Follow
Ian T. Cruz
ISCOSEU NewsWire - Please be informed! (Tweet/RT/following does not = endorsement)767 followers | Follow
SpaceRef China
Covering the space activities from China. A service from @SpaceRef.714 followers | Follow
Astrium GEO
Geoinformation provider, satellite images, geospatial data, 3D solutions,...713 followers | Follow
Ralf Vandebergh
Astrophotographer specializing in high-resolution imaging of spacecraft in orbit. Science journalist working for Dutch & Belgian newspapers & magazines668 followers | Follow
zarya.info
1 - What's New - http://www.zarya.info 2 - Timely reminders of satellite & spacecraft launches, EVAs, ISS events, webcasts 3 - What's happening in orbit664 followers | Follow
Nordic Geospatial
Nordic Geospatial Consulting marshals the latest geospatial technology for advanced public policy analysis and results.618 followers | Follow
SpaceQuarterly
Space Quarterly is a new magazine produced by @SpaceRef focusing on commercial space, space policy & military space as well as other timely topics.612 followers | Follow
Mike Hapgood
Space weather scientist building links with user community. Putting meaning into impact.594 followers | Follow
Michael J. Listner
Attorney, writer, expert and analyst on space law and policy. Legal and Policy Editor to Space Safety Magazine. Tweets do not constitute legal advice.524 followers | Follow
Turner Brinton
500 followers | Follow
USGIF President
USGIF President / GEOINT Advocate / ISR Futurist / Husband / Father (Not in that order)470 followers | Follow
AstriumGEO_NA
Astrium GEO-Information Services offers a wide range of solutions sourced from multi-resolution, multi-sensor optical and SAR satellites.372 followers | Follow
Jonathan McDowell
351 followers | Follow
L Christer Andersson
The Twitter Channel for L Christer Andersson. I am a senior scientist at the Swedish Defence Research Agency (FOI) specialized in space & defence policy issues.215 followers | Follow
Dragon-in-Space
China's space program: human spaceflight and space station, lunar exploration, satellites and facilities152 followers | Follow
Satellite Imaging
Covering groundbreaking news about satellite technology and publishing stunning satellite imagery.138 followers | Follow
OnOrbitWatch
Discussing space debris and situational awareness all in one place.130 followers | Follow
FalconView
94 followers | Follow
Vuxicon МедиаИмперия
24/7 news from and about outer space #education #hope #cosmos #MIR #ISS #NASA #Alien #Universe Part of @Vuxicon66 followers | Follow
Satellite Imagery
ScapeWare3d is a Satellite Aerial Imagery Distribution Company.36 followers | Follow
UndercoveredNews.com
The News You Need and The Headlines You Haven't Heard Enough Of - The most important news stories undercovered by the mainstream media.22 followers | Follow
