Related by context. Frequent words. (Click for all words.) 65 magnetosphere 63 heliosheath 62 Earth magnetosphere 62 magnetic reconnection 59 heliosphere 59 electron density 59 polar vortex 58 interstellar medium 58 ionized gas 58 Oort Cloud 56 lithosphere 55 X ray emission 55 comet tail 55 gravitational attraction 55 magnetic fields 55 accretion disk 55 gravitationally 54 magnetization 54 bilayer 54 planetesimals 54 mid latitudes 54 Gamma rays 54 Valles Marineris 54 meteoroids 53 coronal mass ejection 53 poleward 53 GPa 53 dipoles 53 silicon atoms 53 ionosphere 53 gravitational 53 magnetic 53 ejecta 53 electron spins 52 oscillations 52 Itokawa 52 interstellar space 52 solar nebula 52 magnetic flux 52 Cosmic rays 52 WASP #b 52 spacetime 51 ionize 51 orbiting planets 51 excitons 51 ionised 51 perturbations 51 oscillation 51 vortices 51 actin filaments 51 Iapetus 51 oscillatory 51 crystal lattice 51 perihelion 51 equator 51 atomic nuclei 51 silicates 51 ITCZ 51 visible wavelengths 51 temperature gradient 50 radially 50 Kuiper Belt objects 50 auroral 50 innermost planet 50 optical wavelengths 50 exciton 50 radiative 50 supercooled 50 supernova explosion 50 nuclei 50 electrons 50 Kuiper belt 50 muons 50 torus 50 filaments 50 phonons 50 amplitudes 50 conductance 50 jet stream 50 adsorbed 50 lithium ions 50 observable universe 50 aurorae 50 meteoroid 50 troposphere 49 excitations 49 dimer 49 Brownian motion 49 interferometers 49 hydrogen ions 49 antiprotons 49 Arctic Oscillation 49 planet orbits 49 solar corona 49 equatorial regions 49 dispersive 49 dipole 49 helices 49 electron beams 49 chloride ions 49 orbitals