Related by context. Frequent words. (Click for all words.) 48 human spaceflight 48 lunar exploration 45 Crew Exploration 45 manned spaceflight 44 unsustainable 44 Ares rocket 42 fiscally sustainable 41 Orion capsule 41 manned missions 41 unachievable 41 ambitious 41 lunar missions 41 Orion spacecraft 40 NASA 40 achievable 39 overly ambitious 39 Hubble servicing 39 manned spacecraft 39 spaceflight 39 X #B 39 woefully underfunded 39 Constellation 38 Earth orbit 38 JWST 38 overly optimistic 38 NPOESS 38 robotic spacecraft 38 unattainable 38 Nasa 37 orbiting telescope 37 underfunded 37 Perminov 37 shuttle fleet 37 SBIRS 37 space shuttle 37 technologically feasible 37 Joint Strike Fighter 37 CalFed 37 NASA Administrator 37 orbiting 36 Columbia Accident Investigation 36 Readdy 36 Anatoly Perminov 36 sounder footing 36 Systems Mission Directorate 36 severely underfunded 36 inherently flawed 36 Shuttle Atlantis 36 unrealistic 36 manager Ron Dittemore 36 Cassini Huygens 36 sub orbital 35 orbiter 35 Shuttle Endeavour 35 spacecraft 35 unaffordable 35 fundamentally flawed 35 Galileo satellite 35 unsustainably 35 lunar lander 35 Deep Impact mission 35 orbit 35 Brian Riedl 35 International Space Station 35 upward spiral 35 curbing greenhouse gases 35 curbing greenhouse gas 34 Space Exploration 34 Space Shuttle 34 borrowing binge 34 National Nanotechnology Initiative 34 Atlas V 34 Marion Blakey 34 underfunding 34 planetary exploration 34 Hubble telescope 34 Space Shuttle Program 34 Centennial Challenges 34 overly rosy 34 X PRIZE 34 JAXA 34 CEV 34 US#.# trillion [001] 34 expansionary monetary policy 34 Airborne Laser 34 statistical blip 34 lunar orbiter 34 Hubble Space Telescope 34 fatally flawed 34 Orbiting Carbon Observatory 34 X Prize 33 misplaced priorities 33 spaceship 33 XCOR Aerospace 33 Joint Strike Fighter JSF 33 Quadrennial Defense Review 33 Space Agency 33 misallocated 33 astronomic 33 upward trajectory 33 expansionary