Related by context. Frequent words. (Click for all words.) 66 magnetosphere 66 troposphere 62 magnetic fields 62 cosmic ray 60 cosmic rays 58 solar flares 58 auroras 57 electromagnetic 57 infrared radiation 56 gravitational waves 55 geomagnetic field 54 Martian atmosphere 54 laser pulses 54 gamma rays 54 convective 54 atmospheric 53 electromagnetic waves 53 cosmic microwave background 53 cosmic radiation 52 water vapor 52 Saturn rings 52 seismic waves 52 infrared wavelengths 52 oscillations 52 orbits 51 comet 51 dipole 51 electromagnetic spectrum 51 gamma ray burst 51 photons 51 latitudes 51 distant galaxies 51 polar regions 51 quasars 50 elliptical orbit 50 quasar 50 Solar System 50 laser pulse 50 gravitational 50 electrical currents 50 aurora 50 lunar surface 50 electrons 50 corona 50 orbital 49 stratosphere 49 Cassini 49 starlight 49 dynamical 49 redshift 49 vortices 49 Earth orbit 49 vibrational 49 albedo 49 comets 49 magnetic 49 jet stream 49 sunspots 48 Enceladus 48 interstellar space 48 aerosols 48 electron 48 wavelengths 48 orbiting satellites 48 polar orbit 48 satellites 48 electromagnetic radiation 48 Martian surface 47 sunspot 47 waveguide 47 laser beams 47 galaxy clusters 47 polar 47 spacecraft 47 photon 47 galaxies 46 wavelength 46 Uranus 46 ionized 46 infrared 46 conductance 46 quantum mechanical 46 equatorial 46 ionization 46 conductivity 46 Mars Odyssey 46 velocities 46 volcanism 46 orbit 46 diffraction 46 superconducting 46 pulsar 46 Kuiper Belt 46 galaxy 46 THEMIS 46 excitation 46 exoplanet 46 gamma ray bursts 46 asteroid 46 equator 46 impactor