Related by context. Frequent words. (Click for all words.) 50 Centennial Challenges 48 Orion spacecraft 47 SOFCs 46 EcoCAR 46 Commercial Orbital 46 propulsion 45 Smart NanoBattery 45 microfluidic devices 45 Lunar X PRIZE 45 nanostructured materials 44 CubeSat 44 nanosystems 44 lunar rover 44 Research ONR 44 Dragon spacecraft 44 Dyneema 43 Orion capsule 43 lunar lander 43 X PRIZE 43 spacecrafts 43 CH #K 42 electromagnet 42 propulsion systems 42 scramjet 42 Spacehab 42 SOFC 42 proton exchange 42 Space Elevator 42 AFRL 42 DARPA Urban 41 lithium polymer batteries 41 PEM fuel 41 lunar missions 41 Automotive X PRIZE 41 actuators 41 autonomous robots 41 Orbital Sciences Corporation 41 nano structured 41 Ares IX 41 LaserMotive 41 SwRI 41 spacecraft 41 Protonex 41 DARPA 41 Crew Exploration 40 superalloys 40 FIRST Robotics Competition 40 SpaceX Falcon 9 40 Orbital Sciences Corp. 40 composite materials 40 electromagnets 40 FIRST Robotics 40 Testbed 40 STTR 40 Launch Vehicle 40 solid rocket boosters 40 CFRP 40 Li ion batteries 40 EPSCoR 40 Research Laboratory AFRL 39 SBIR grant 39 ARPA E 39 solid propellant 39 SuitSat 39 Systems Mission Directorate 39 nanodevices 39 GOES R 39 DARPA Grand 39 electric propulsion 39 & Whitney Rocketdyne 39 RF MEMS 39 lightweight composite 39 robotic spacecraft 39 lunar orbiter 39 liquid hydrogen 39 ultracapacitors 39 prototypes 39 Ares rocket 39 interplanetary spacecraft 39 combustor 39 components subsystems 39 Collaboratory 39 SpaceX 39 Centaur upper 39 hypersonic flight 39 Bigelow Aerospace 38 autonomous underwater 38 X PRIZE Foundation 38 thruster 38 EPSRC 38 Armadillo Aerospace 38 based Midcourse Defense 38 carbon nanotube 38 carbon fibers 38 hydrogen 38 TARDEC 38 propellant 38 SpaceDev 38 nanocomposite 38 stretchable 38 1kW