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Any of six magnetosphere-observing satellites in the '60s
Else clues• 1960s orbiter: abbr.
• Ger. handheld internet access device (or, '60s U.S. scientific satellite prog.)
• Palindromic 1960s orbiter: abbr.
• Satellite prog., 1964-69
• U.S. satellite
• U.S. satellite of the '60s
• U.S. scientific satellite of the 60's