NASA TV"NASA Television is actually three accessible digital channels:"
"NASA Public, transmitting in HD, features coverage of NASA missions and events, plus documentaries, archival and other special programming. This is the "NASA TV" most often carried by cable and satellite service providers."
"NASA Education provides programming to schools, educational institutions and science museums."
"NASA Media provides coverage in HD of news conferences and relevant video and audio materials to national and international news-gathering organizations."
"Note: NASA TV channels may not always have programming on every channel simultaneously. "