Related by context. Frequent words. (Click for all words.) 66 Earth magnetosphere 65 magnetosphere 63 heliosphere 62 photosphere 61 heliosheath 61 solar corona 60 exosphere 60 magnetic reconnection 59 spacetime 58 interplanetary spacecraft 58 martian atmosphere 57 tropospheric 57 polar vortex 57 auroral 57 ionosphere 57 optical wavelengths 57 magnetic flux 56 ellipsoid 56 Galileo spacecraft 56 metallicity 56 mesosphere 56 cosmic ray 55 substorm 55 photometer 55 interstellar medium 55 planetesimals 55 ejecta 55 active galactic nuclei 55 ionized gas 55 gravitational wave 55 astrophysical 55 redshifts 55 Galaxy Evolution 54 meteoroid 54 X ray emission 54 interferometers 54 electron density 54 magnetic fields 54 electron spins 54 visible wavelengths 54 interferometric 54 outer planets 54 ionospheric 54 Kuiper belt 53 interferometry 53 photoluminescence 53 accretion disk 53 diffraction pattern 53 planetary nebulae 53 meteoroids 53 comet tail 53 anisotropic 53 anisotropy 53 VIRTIS 53 plasmon 52 galaxy formation 52 perihelion 52 cosmic rays 52 planet Uranus 52 numerical simulations 52 dynamical 52 Oort Cloud 52 protostars 52 superfluid 52 torus 52 interstellar dust 52 phonon 52 solar nebula 52 interstellar space 52 oscillations 52 cosmic microwave background 52 Voyager spacecraft 52 magnetization 52 amplitudes 52 spectrographs 52 fluorescing 52 convective 52 radiative 52 haloes 52 supernova remnant 51 moon Enceladus 51 excitations 51 gravitational waves 51 bilayer 51 Jupiter Saturn 51 Brownian motion 51 infrared wavelength 51 gravitational 51 ultraviolet wavelengths 51 lithosphere 51 highly elliptical orbit 51 quantum gravity 51 protoplanetary disk 51 Cosmic rays 51 dispersive 51 Hinode 51 comet nucleus 51 OSIRIS 51 optical lattice 51 ionised 51 excitons