Related by context. Frequent words. (Click for all words.) 64 supernova remnant 63 X ray emission 62 Eta Carinae 62 magnetar 61 XMM Newton 60 supernova explosion 60 Crab Nebula 59 supernovae 59 supernova 59 quasar 58 supernovas 58 gamma ray burst 58 Orion Nebula 58 ejecta 57 dwarf galaxy 57 X ray Observatory 57 accretion disk 57 GRBs 57 quasars 57 galaxy clusters 56 redshift 56 pulsar 56 NASA Chandra 56 supernova explosions 55 comet nucleus 55 elliptical galaxies 55 cosmic microwave background 55 gamma ray 55 Saturn rings 54 galaxy cluster 54 interferometry 54 distant galaxy 54 gamma rays 54 neutron stars 54 spiral galaxies 54 gravitational lensing 54 gamma ray bursts 53 spectroscopic 53 HD #b [002] 53 distant galaxies 53 infrared wavelengths 53 Milky Way Galaxy 53 CMEs 53 neutron star 53 muon 52 galaxy formation 52 quark gluon plasma 52 optical telescopes 52 planet orbits 52 ionized gas 52 ringed planet 52 galaxies 52 auroral 52 GeV 52 Andromeda galaxy 52 extrasolar planet 51 astronomical objects 51 coronal mass ejection 51 comet 51 solar flares 51 infrared telescope 51 NASA Cassini spacecraft 51 supermassive black hole 51 corona 51 pulsars 51 infrared spectrometer 51 optical microscopy 51 Chandra X ray 50 meteoroid 50 astronomers 50 globular cluster 50 cosmic ray 50 spectra 50 WMAP 50 Earth magnetosphere 50 globular clusters 50 subatomic particle 50 Milky Way galaxy 50 cosmic rays 50 photonic crystal 50 spiral galaxy 50 ionospheric 50 X ray beam 50 ESO Very Large Telescope 50 extrasolar planets 50 IceCube 50 coronal mass ejections 50 Computer simulations 50 Spitzer Space Telescope 50 gravitational wave 50 Betelgeuse 49 nebula 49 dwarf galaxies 49 positron 49 spherical 49 Very Large Array 49 interstellar dust 49 nebulae 49 Palomar Observatory 49 Kepler telescope 49 Andromeda Galaxy