NASA TV is the television service of the United States government agency NASA. NASA TV is broadcast by satellite with a simulcast over the Internet. Local cable television systems across the U.S. and amateur television repeaters may carry NASA TV at their discretion, as NASA created content is considered a work of the U.S. government and is in the public domain. The network was formally created in the early 1980s to provide NASA managers and engineers with real time video of missions. NASA has operated a television service since the beginning of the space program for archival purposes, and in order to provide media outlets with video footage.(Wikipedia) Ustream nasahdtv NASA TV Website