Related by context. Frequent words. (Click for all words.) 61 Gamma ray bursts 60 substorm 57 GRB # 57 novae 57 Galaxy Evolution 56 helium atoms 56 ultraviolet wavelengths 56 X ray emission 56 gamma ray burst 56 solar corona 56 GRBs 55 Gamma rays 55 red supergiant 55 interstellar clouds 55 Type Ia supernovae 54 active galactic nuclei 54 gamma ray bursts 54 gamma ray 54 accretion disk 54 magnetars 53 magnetar 53 gamma rays 52 magnetic reconnection 52 stellar nurseries 52 XMM Newton 52 photosphere 52 distant galaxies 52 Crab Nebula 51 moon Enceladus 51 Cosmic rays 51 globular star 51 Eta Carinae 51 Carina Nebula 51 Solar flares 51 supernova remnant 51 Supernovae 50 optical wavelengths 50 cosmic particles 50 galaxy formation 50 auroras 50 bursts 50 supernova remnants 50 infrared wavelength 50 Gehrels 50 galaxy clusters 50 distant galaxy 50 aurorae 50 infrared wavelengths 49 smoke plumes 49 galaxy NGC 49 nanobubbles 49 Earth magnetosphere 49 phosphorescence 49 Hawking radiation 49 microlensing 49 Andromeda galaxy 49 laser pulse 49 faint glow 49 protostars 49 Galileo spacecraft 49 Cepheids 49 infrared radiation 49 auroral 49 substorms 49 quasar 49 protostar 49 meteoroid 49 protoplanetary disk 49 cosmic microwave background 49 galaxy cluster 49 soundwaves 49 exosphere 48 constellation Virgo 48 Lick Observatory 48 visible wavelengths 48 ionized gas 48 collimated 48 subatomic particle 48 pulsars 48 gravitational wave 48 aurora 48 diffracted 48 comet tail 48 gravitational lens 48 gravitational interactions 48 photoluminescence 48 Cosmologists 48 stimulated emission 48 supernovae 48 astronomical objects 48 redshifts 48 dwarf galaxy 48 interstellar dust 48 Ultraviolet light 47 interplanetary spacecraft 47 supernova 47 particles emitted 47 planetary nebulae 47 X ray Observatory 47 radial velocity 47 microwave radiation