Related by context. Frequent words. (Click for all words.) 64 supernova remnants 63 planetary nebulae 63 Gamma ray bursts 62 active galactic nuclei 61 Pulsars 60 Gamma rays 60 magnetar 59 neutron stars 58 Eta Carinae 58 pulsars 58 excitons 58 accreting 58 X ray emission 58 supernova explosions 58 neutron star 57 WIMPs 57 dwarf galaxy 57 accretion disk 57 galaxy formation 57 Cosmic rays 57 distant galaxy 57 Saturn rings 57 ionized gas 57 nebulae 57 supernova remnant 56 distant galaxies 56 solar corona 56 GRBs 56 spiral galaxies 56 antiprotons 56 planetary nebula 56 Quantum dots 56 galaxy clusters 56 muon 56 globular cluster 56 galaxies 56 ionised 55 supermassive black holes 55 supernovae 55 dwarf galaxies 55 solar nebula 55 hot Jupiters 55 muons 55 gamma ray bursts 55 colliding galaxies 55 nuclei 55 filaments 55 planet orbits 55 magnetic fields 54 elliptical galaxies 54 electron beams 54 supernova explosion 54 quasars 54 pulsar 54 shorter wavelengths 54 ejecta 54 quasar 54 ionize 54 globular clusters 54 super Earths 54 laser pulses 54 rocky planets 54 galaxy cluster 54 gravitationally 54 interstellar dust 54 Hawking radiation 54 excitations 54 atomic nuclei 54 brown dwarfs 53 atoms 53 supernovas 53 Jupiter Saturn Uranus 53 pulsations 53 gamma ray burst 53 vortices 53 Galaxy Evolution 53 Type Ia supernovae 53 Hubble observations 53 aerosol particles 53 habitable zones 53 magnetic reconnection 52 phonons 52 positrons 52 Andromeda Galaxy 52 auroral 52 planets circling 52 atomic particles 52 observable universe 52 gravitational wave 52 interstellar medium 52 Large Magellanic Cloud 52 electrons 52 subatomic particle 52 subatomic particles 52 hydrogen atoms 52 nanocrystals 52 terrestrial planets 52 Ultraviolet light 52 X ray Observatory 52 liquid droplets 52 spacetime