Answer: inspace

AnswerCrossword Clue
INSPACELost ...
INSPACEWhere the Robinsons were lost
INSPACEHeading for Mars
INSPACEOrbiting
INSPACEOn a shuttle, maybe
INSPACEWhere we're weightless
INSPACEWhere one is weightless
INSPACEWhere the Robinsons were lost on 1960s TV