Related by context. Frequent words. (Click for all words.) 57 Gamma ray bursts 57 Type Ia supernovae 56 planetary nebulae 56 astronomical objects 56 active galactic nuclei 55 GRBs 55 redshifts 55 astronomical observations 55 XMM Newton 54 supernovas 54 gravitational lensing 53 Jupiter moons 53 astronomers 53 globular clusters 53 supernova remnant 53 brown dwarfs 53 elliptical galaxies 53 quasars 52 spectroscopic 52 supernova remnants 52 photometric 52 spiral galaxies 52 planets circling 52 galaxy formation 52 shorter wavelengths 51 X ray emission 51 Hubble observations 51 haloes 51 cosmologists 51 Cosmic rays 51 galaxy clusters 51 Milky Way Galaxy 51 planetary nebula 51 Computer simulations 51 Astrophysicists 50 cosmic rays 50 infrared wavelengths 50 interferometry 50 redshift 50 HD #b [002] 50 astrophysical 50 pulsars 50 solar corona 50 celestial objects 50 supernovae 50 super Earths 50 extrasolar planets 50 planet orbiting 50 distant galaxies 50 Galaxy Evolution 50 planets 50 cosmic microwave background 49 microlensing 49 Gamma rays 49 Orion Nebula 49 Crab Nebula 49 astrophysicists 49 nebulae 49 magnetar 49 Saturn rings 49 planets orbiting 49 visible wavelengths 49 hot Jupiters 49 nebula 49 habitable planets 49 cosmic ray 49 abundances 48 exoplanets 48 COROT 48 galaxies 48 occultation 48 gravitational wave 48 interplanetary spacecraft 48 comet nucleus 48 observable universe 48 distant galaxy 48 orbiting planets 48 Andromeda galaxy 48 innermost planet 48 infrared spectroscopy 48 solar nebula 47 dwarf galaxies 47 Eta Carinae 47 magnetic fields 47 globular cluster 47 Spitzer Space Telescope 47 WIMPs 47 ringed planet 47 isotopic composition 47 statistical anomalies 47 quasar 47 moons 47 wavelengths 47 star Gliese 47 gamma ray bursts 47 habitable zones 47 moon Europa 47 accretion disk 47 NICMOS 47 supernova explosions 47 muon