Related by context. Frequent words. (Click for all words.) 58 protoplanetary disk 57 martian atmosphere 57 photosphere 57 accretion disk 57 lithosphere 55 polar vortex 55 exosphere 54 ionised 54 Galileo spacecraft 54 outer crust 54 planetesimals 54 X ray emission 54 protostar 54 helium atoms 54 red supergiant 53 supernova explosion 53 Gamma rays 53 solar nebula 53 ionized gas 53 WASP #b 52 gravitational attraction 52 meteorite impacts 52 ionize 52 supernova explosions 52 Earth magnetosphere 52 Cabeus crater 52 Carina Nebula 52 magnetar 51 Solar flares 51 cesium atoms 51 Martian dust 51 protostars 51 radioactive decay 51 outer layers 51 moon Enceladus 51 solar corona 51 highly elliptical orbit 51 substorm 51 planet orbits 50 magnetosphere 50 magnetic flux 50 gyres 50 interstellar medium 50 -# degrees Fahrenheit [002] 50 superhot 50 vortices 50 Cosmic rays 50 heliosheath 50 vortex 50 gravitational tug 50 Iapetus 50 thermosphere 49 spacetime 49 meteoroid 49 observable universe 49 mesosphere 49 twin rover Spirit 49 accreting 49 elliptical orbit 49 interplanetary spacecraft 49 magnetic reconnection 49 icy moons 49 comet tail 49 Ultraviolet radiation 49 electrically conducting 48 gaseous planets 48 ringed planet 48 gravitationally 48 oceanic crust 48 gravitational interactions 48 coronal hole 48 crustal 48 comet nucleus 48 active galactic nuclei 48 gravitational 48 radiative 48 neutron star 48 molten iron 48 Brownian motion 48 innermost planet 48 oscillations 48 galaxy NGC 47 interferometers 47 magnetic fields 47 tropopause 47 magnetars 47 circular orbits 47 Kuiper belt 47 upper troposphere 47 pulsar 47 outermost layer 47 Oort Cloud 47 icy crust 47 heliosphere 47 convective 47 ejecta 47 torus 47 Hawking radiation 47 nanobubbles 47 convection 47 -# ° C [001]