Related by context. Frequent words. (Click for all words.) 77 neutron star 72 supermassive black hole 69 galaxy clusters 68 quasar 67 neutron stars 67 supermassive black holes 66 galaxies 66 pulsar 65 supernova 65 nebula 64 quasars 64 galaxy 64 distant galaxies 63 supernovae 62 gamma ray burst 61 gravitational waves 61 gamma rays 61 distant galaxy 61 Milky Way galaxy 61 magnetosphere 60 gravitational 60 brown dwarf 60 brown dwarfs 60 dwarf galaxies 60 supernovas 60 comet 60 magnetic fields 59 Milky Way 59 pulsars 59 spiral galaxy 59 planet orbiting 58 nebulae 58 rocky planets 58 gamma ray bursts 58 corona 58 vortices 58 Enceladus 58 nuclei 57 planets 57 heliosphere 57 X ray Observatory 57 Saturn rings 56 cosmic dust 56 cosmic microwave background 56 convective 56 gaseous 56 electrons 56 astrophysical 55 subatomic particles 55 exoplanet 55 particles 55 Iapetus 55 cosmic rays 55 laser pulse 55 outer layers 55 XMM Newton 54 electron 54 interstellar space 54 atoms 54 neutrino 54 exoplanets 54 hydrogen atoms 54 planets orbiting 53 dynamical 53 infrared radiation 53 comets 53 positrons 53 neutrinos 53 redshift 53 ionosphere 53 subatomic 53 proton 53 Betelgeuse 53 orbits 53 filaments 53 extrasolar planets 53 general relativity 53 gravitational pull 53 astrophysicists 52 photons 52 galactic 52 Einstein theory 52 infrared wavelengths 52 magnetization 52 cosmic ray 52 atomic particles 52 astronomers 52 ionized 52 water vapor 51 starlight 51 asteroid 51 molten rock 51 NASA Chandra 51 protons 51 gamma ray 51 magma 51 neutrons 51 Solar System 51 filament 51 spectroscopic 51 magnetic