Related by context. Frequent words. (Click for all words.) 67 astrophysical 66 globular clusters 66 galaxies 65 supernovae 64 galaxy clusters 64 brown dwarfs 63 distant galaxies 63 neutron stars 62 supermassive black holes 62 quasars 62 cosmological 62 supernovas 62 neutron star 61 rocky planets 61 supernova explosion 60 dynamical 60 general relativity 60 dwarf galaxies 59 planets 59 gamma ray bursts 58 galaxy cluster 58 gravitational waves 58 spacetime 58 astrophysicists 58 interstellar medium 58 quasar 57 cosmologists 57 spectroscopic 57 astronomers 57 cosmic microwave background 57 Saturn rings 57 nebulae 57 brown dwarf 56 redshift 56 spiral galaxies 56 nuclei 56 galaxy 55 gamma ray burst 55 distant galaxy 55 pulsars 55 nucleation 55 neutrino 55 Enceladus 55 subatomic 55 exoplanet 55 supernova 55 planetary 55 comets 54 cosmology 54 organic molecules 54 atmospheric chemistry 54 WMAP 54 magnetic fields 54 XMM Newton 54 Milky Way galaxy 54 supermassive black hole 54 quantum mechanics 54 outer planets 54 Milky Way Galaxy 54 Astrophysical Journal 54 Milky Way 54 Einstein theory 53 interstellar dust 53 planets orbiting 53 quantum theory 53 cosmic rays 53 extrasolar planets 53 magnetosphere 53 NASA Chandra 53 X ray Observatory 52 planet orbiting 52 convective 52 Astrophysical Journal Letters 52 high temperature superconductors 52 cosmic ray 52 neutrinos 52 topological 52 astrophysics 52 radioactive decay 52 molecular dynamics 51 galactic 51 exoplanets 51 gamma rays 51 chemical reactions 51 atmospheric circulation 51 nebula 51 subatomic particles 51 plate tectonics 51 Chandra X ray 51 comet 51 extrasolar planet 51 pulsar 51 Astronomers 51 Solar System 50 Big Bang theory 50 CMEs 50 corona 50 heliosphere 50 cometary 50 atoms 50 abundances