NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
ACTS deployment. NASA's Advanced Communications Technology Satellite (ACTS) seen shortly after launch from Shuttle Discovery during Mission STS- 51. The cylindrical object closest to the camera is the Transfer Orbit Stage booster (TOS), used to propel the satellite from the low orbit of the Shuttle to its final geostationary orbit. The satellite is the box-shaped object sitting on the TOS. The solar panels and antennae are in their stowed position. ACTS is a testbed for future communications satellite technology, such as multi-beam antennae and advanced signal handling. ACTS was deployed on the first day of the mission which flew on 12-22 September 1993.
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