Related by context. Frequent words. (Click for all words.) 59 hypersonic speeds 56 geosynchronous 54 highly elliptical orbit 54 Stratellite 53 MAVs 53 elliptical orbits 53 scramjets 52 Earth gravitational pull 52 interplanetary spacecraft 51 circular orbits 51 GMLRS 51 geosynchronous orbit 51 SIRTF 51 orbital 50 microgravity environment 50 lightweight composites 50 compressed nitrogen 50 payload 50 payloads 49 DAGR 49 Scramjet 49 airflows 49 ultraviolet wavelengths 49 LCROSS spacecraft 49 interferometers 49 optical wavelengths 49 laser altimeter 49 Galileo satellites 49 Lagrangian 48 spacecrafts 48 unpressurized 48 X ray telescopes 48 icy moons 48 VTOL 48 interplanetary missions 48 ramjet 48 ion propulsion 48 exosphere 48 geostationary 48 geostationary satellites 48 collimated 47 spacecraft 47 manoeuvrable 47 hypersonic flight 47 unpiloted 47 Earth magnetosphere 47 NanoSail D 47 robotic rovers 47 infrared wavelength 47 curvature 47 shorter wavelengths 47 heavier loads 47 rockets 47 geostationary orbit 47 guided munitions 47 Minotaur IV 47 CubeSat 47 airfoils 46 shuttle orbiter 46 Esrange 46 Gyroscopes 46 gaseous hydrogen 46 highly maneuverable 46 atmospheric turbulence 46 circular orbit 46 propulsion 46 rotate 46 gaseous planets 46 scramjet engine 46 solar corona 46 unpowered 46 laser designator 46 deorbit 46 millimeter wave radar 46 CALIPSO 46 HIMARS 46 autonomous robotic 45 payload fairing 45 spectrographs 45 Virgin Galactic SpaceShipTwo 45 visible wavelengths 45 ultrasonic sensors 45 equator 45 steerable 45 radar altimeter 45 CubeSats 45 Kuiper Belt objects 45 liquid propellant 45 flybys 45 Suborbital 45 Opportunity rovers 45 z axis 45 railgun 45 magnetosphere 45 HiRISE camera 45 nanosatellite 45 orbits 45 maneuverability 45 astronomical objects 45 maneuverable 45 directional antenna