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Neil deGrasse TysonHimself
Bill NyeHimself
Michio KakuHimself
Jim LovellHimself
Gene KranzHimself
Lawrence KraussHimselfRobert ZubrinHimselfLeroy ChiaoHimselfStory MusgraveHimselfRick TumlinsonHimselfMarcia SmithHerselfNeil deGrasse TysonHimselfBill NyeHimselfMichio KakuHimselfJim LovellHimselfGene KranzHimselfLawrence KraussHimselfRobert ZubrinHimselfLeroy ChiaoHimselfStory MusgraveHimselfRick TumlinsonHimselfMarcia SmithHerself