Related by context. Frequent words. (Click for all words.) 61 Gamma ray bursts 61 pulsars 60 active galactic nuclei 58 magnetars 58 Pulsars 56 WASP #b 56 supernova explosions 56 planetary nebulae 56 supernova explosion 55 supernovas 55 coronal mass ejections 55 solar corona 54 Gamma rays 54 X ray emission 54 Hawking radiation 54 supernova remnants 54 magnetar 54 galaxy formation 53 neutron star 53 accretion disk 53 GRBs 53 Eta Carinae 53 substorms 53 planetary nebula 53 nebulae 53 Cosmic rays 53 circular orbits 52 supernovae 52 neutron stars 52 quasars 52 gamma ray bursts 52 super Earths 52 distant galaxies 52 colliding galaxies 52 moonlets 52 planetesimals 52 Cosmologists 52 WIMPs 52 pulsar 51 gravitational waves 51 protoplanetary disk 51 colliders 51 brown dwarfs 51 ionize 51 subatomic particle 51 Cepheids 51 subatomic particles 51 accreting 51 supernova 51 supermassive black holes 50 galaxies 50 Type Ia supernovae 50 galaxy clusters 50 God Particle 50 excitons 50 Kuiper belt 50 particle detectors 50 Astrophysicists 50 gamma ray burst 50 gamma rays 50 globular cluster 50 quanta 49 dwarf galaxy 49 interplanetary spacecraft 49 optical telescopes 49 elliptical galaxies 49 rocky planets 49 distant galaxy 49 spacetime 49 microwave radiation 49 magnetic reconnection 49 aurorae 49 ionized gas 49 Andromeda galaxy 49 habitable zones 49 planets 49 atomic particles 49 particle beam 49 orbiting Saturn 48 gravitational wave 48 exoplanets 48 muons 48 alien civilizations 48 observable universe 48 orbiting planets 48 Oort Cloud 48 CMEs 48 Photons 48 outer planets 48 excitations 48 quasar 48 magnetic fields 48 quark gluon plasma 48 starbursts 48 Higgs particle 48 solar flares 48 microlensing 48 Crab Nebula 48 habitable planets 48 gravitational attraction 48 Jupiter moons