Related by context. Frequent words. (Click for all words.) 63 active galactic nuclei 61 Cepheids 61 Type Ia supernovae 60 Kuiper belt 59 planetary nebulae 59 dwarf galaxy 59 GRBs 59 X ray emission 58 magnetar 58 galaxy formation 58 baryons 57 Gamma ray bursts 57 magnetars 57 Hawking radiation 57 WASP #b 57 globular cluster 57 dwarf galaxies 56 supernova explosion 56 accretion disk 56 elliptical galaxies 56 supernova explosions 56 aurorae 56 gravitational lensing 56 planetesimals 55 globular clusters 55 Hubble observations 55 galaxy clusters 55 planetary nebula 55 moonlets 55 quasars 55 Higgs particle 55 supernova remnant 55 shorter wavelengths 54 ionized gas 54 supernova remnants 54 visible wavelengths 54 Oort Cloud 54 fluorescing 54 Galaxy Evolution 54 HD #b [002] 54 redshifts 54 nebulae 54 galaxies 54 orbiting planets 54 spiral galaxies 54 frequency comb 54 solar corona 54 Eta Carinae 54 rocky planets 54 optical wavelengths 54 astronomical objects 53 excitations 53 habitable planets 53 WIMPs 53 crystal lattice 53 Crab Nebula 53 exciton 53 supernovae 53 auroral 53 galaxy cluster 53 distant galaxy 53 electron spins 53 fermions 53 Bose Einstein condensate 53 bosons 53 fluorophores 53 observable universe 53 photometry 53 positrons 53 XMM Newton 52 solar nebula 52 quark gluon plasma 52 GRB # 52 spectrally 52 distant galaxies 52 excitons 52 Cosmic rays 52 gamma ray bursts 52 gamma ray burst 52 nuclei 52 Kuiper Belt objects 52 interstellar dust 52 magnetic reconnection 52 morphologies 52 interstellar medium 52 interferometry 52 heliosheath 52 Earth magnetosphere 52 radioactive decay 52 radial velocity 51 gravitational wave 51 spacetime 51 galaxy 51 haloes 51 Jupiter Saturn 51 accreting 51 gravitationally 51 elemental composition 51 ejecta 51 Gamma rays 51 infrared wavelengths