Related by context. Frequent words. (Click for all words.) 53 circular orbit 53 resonant frequency 53 elliptical orbit 52 orbits 52 orbit 49 velocities 49 substorms 49 gravitational attraction 48 Earth magnetosphere 48 angular momentum 48 occultation 48 comet nucleus 48 radioactive decay 47 gravitational 47 ejecta 47 velocity 47 gravitational pull 46 GOCE 46 spacecrafts 46 sunspot numbers 46 heliosphere 46 lithosphere 46 meteoroid 46 aerosol particles 45 lunar orbit 45 interplanetary spacecraft 45 picoseconds 45 perigee 45 celestial bodies 45 ionosphere 45 thermosphere 45 surface roughness 45 periodicity 45 Saturn rings 45 magnetic flux 45 chirality 45 orbital 45 oscillations 45 magnetic fields 44 X ray emission 44 spacetime 44 magnetosphere 44 temperature 44 gravity 44 equinoxes 44 picosecond 44 Gamma ray bursts 44 spherical shape 44 pulsations 44 spacecraft 44 dust particles 44 antiprotons 44 visible wavelengths 44 geosynchronous orbit 44 gaseous hydrogen 44 centrifugal force 44 curvature 44 gravitationally 44 atomic nuclei 44 cosmic ray 44 magnetization 43 GeV 43 Venusian 43 troposphere 43 cosmic radiation 43 gravitational tug 43 chemical composition 43 Comet Tempel 1 43 accretion disk 43 precession 43 Martian surface 43 Martian atmosphere 43 albedo 43 Uranus 43 comet 43 seismic waves 43 precise measurements 43 bandgap 43 Earth orbit 43 New Horizons spacecraft 43 geomagnetic storms 43 orbiting telescope 43 Brownian motion 43 cosmic rays 42 Cabeus crater 42 orbit insertion 42 interstellar dust 42 outer planets 42 excitons 42 droplet size 42 water vapor 42 regolith 42 dynamical 42 clubhead speed 42 polar orbit 42 refractive index 42 particle beam 42 COROT 42 meteoroids 42 comet dust 42 cometary