World Library  
Flag as Inappropriate
Email this Article



The Synchronized Position Hold, Engage, Reorient Experimental Satellites (SPHERES) experiment is a testbed consisting of three 8-inch-diameter (200 mm) miniaturized satellites that can operate in a variety of environments, including inside the International Space Station (ISS). The MIT Space Systems Laboratory developed the experiment to provide the Air Force and NASA with a long term, replenishable, and upgradable testbed for formation flight. It will be used to validate high risk control, metrology, and autonomy technologies. The technologies are critical to the operation of distributed satellite and docking missions such as TechSat21, Starlight, Terrestrial Planet Finder, and Orbital Express. The SPHERES concept was inspired by the Training Remotes from Star Wars.[1]


  • Description 1
  • Timeline 2
  • Experiments 3
  • See also 4
  • References 5
  • External links 6


To approximate the dynamics presented by these missions, the testbed consists of three miniaturized satellites, microsatellites or "spheres", which can control their relative positions and orientations, and is operable on a 2-D laboratory platform, NASA's KC-135, and the International Space Station. The testbed is being developed jointly by the MIT Space Systems Laboratory and Aurora Flight Sciences (formerly Payload Systems, Inc.), with funding from the Department of Defense and several NASA centers.

The battery-powered, 8-inch-diameter (200 mm) satellites fly within the ISS cabin using carbon dioxide to fuel 12 thrusters.[2]


Three SPHERES vehicles were delivered to the International Space Station. The first vehicle, along with a limited supply of consumables and support equipment, arrived at the station aboard Progress flight ISS-21P, and single-vehicle tests and experiments began on May 18, 2006. The second vehicle arrived with a much larger supply of consumables aboard Space Shuttle flight STS-121. The final vehicle and consumable supply were delivered to the station on Space Shuttle flight STS-116.

On April 27, 2007, ISS Expedition 15 flight engineer Sunita Williams performed a series of test flights with the satellites.[2]


See also


  1. ^
  2. ^ a b

External links

  • SPHERES website at
  • SPHERES website (new) at
  • SPHERES Test Sessions
  • MIT Space Systems Lab
  • Aurora Flight Sciences
  • "Space Station lightsabre-sparring hoverdroids to be upgraded" at The Register
  • SPHERES website (old) at
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.