Related by context. Frequent words. (Click for all words.) 53 missions 48 Apollo missions 46 sols 46 Discovery STS 43 Apollo lunar 43 hypersonic flight 42 interplanetary spacecraft 42 surpassing 42 spaceflights 41 Discovery liftoff 41 orbit 41 IKONOS 40 spacecraft 40 orbiting 40 surpassed 39 accomplished 39 Hubble servicing 39 planetary exploration 39 Virgin Atlantic GlobalFlyer 39 rovers Spirit 39 Voyager spacecraft 39 spacecrafts 39 interplanetary 39 orbited 39 Messenger spacecraft 39 Mars rovers 39 eclipsing 38 lunar missions 38 shuttle missions 38 orbits 38 EPOXI 38 NASA 38 rovers 38 resupply missions 37 exceeding 37 Shuttle Discovery 37 space shuttle 37 consecutive errorless 37 mythic proportions 37 New Horizons spacecraft 37 reusable spacecraft 36 asteroid 36 Space Shuttle 36 flybys 36 payloads 36 tech balloons gliders 36 Marine expeditionary 36 cumulatively 36 Jackie Milburn 36 Campbell Ky. 36 eclipsed 36 orbit insertion 36 AFSPC 36 Envisat 36 exceeded 36 outer planets 36 equaled 36 galactic 35 robotic spacecraft 35 National Aeronautic 35 innermost planet 35 International Space Station 35 ringed planet 35 mission 35 #th Airlift Squadron [002] 35 Mars orbiter 35 lunar surface 35 spaceship 35 orbiters 35 astronauts 35 sorties 35 GOCE 35 parachute jumps 35 orbiting Mars 35 Kitty Hawk NC 35 planetary missions 35 Stardust spacecraft 35 NEEMO 35 surpass 35 PACAF 35 peacetime 35 spaceports 35 Gorie 35 var heightLimit = 34 martian surface 34 unmanned spacecraft 34 cumulative 34 accomplishing 34 remotely piloted aircraft 34 NASA astronaut corps 34 George Sisler 34 meteoroid 34 Missions 34 Operation Desert Storm 34 orbiter 34 downlinks 34 cosmic ray 34 Hubble Space Telescope 34 human spaceflight 34 airman studied 34 Hubble telescope