Related by context. Frequent words. (Click for all words.) 67 solar corona 66 X ray emission 65 Hubble observations 64 planetary nebulae 63 WASP #b 63 ultraviolet wavelengths 62 gravitational lensing 62 supernova explosions 62 Kuiper belt 62 polar vortex 62 GRBs 62 protoplanetary disk 62 solar nebula 62 galaxy formation 62 astronomical objects 61 active galactic nuclei 61 XMM Newton 61 redshifts 61 SIRTF 61 galaxy clusters 61 visible wavelengths 61 magnetic reconnection 60 Cepheids 60 supernova remnants 60 Gamma ray bursts 60 galaxy cluster 60 Type Ia supernovae 60 optical wavelengths 60 supernova explosion 60 gravitational attraction 59 cosmic microwave background 59 tropospheric 59 distant galaxies 59 infrared wavelengths 59 elliptical galaxies 59 photoluminescence 59 Cosmologists 59 accretion disk 59 planetary nebula 59 Earth magnetosphere 59 spectroscopic 59 magnetar 59 photometry 59 observable universe 59 magnetars 59 auroral 59 WMAP 59 spacetime 58 nebulae 58 planet orbits 58 Oort Cloud 58 Galileo spacecraft 58 astrophysical 58 galaxies 58 radial velocity 58 quasar 58 Crab Nebula 58 quasars 58 interstellar medium 58 globular cluster 58 moonlets 58 redshift 58 baryons 58 aerosol particles 57 dwarf galaxy 57 morphologies 57 electron density 57 globular clusters 57 comet nucleus 57 interferometers 57 ejecta 57 celestial object 57 Higgs particle 57 brown dwarfs 57 distant galaxy 57 Milky Way Galaxy 57 Hawking radiation 57 shorter wavelengths 57 heliosphere 57 interstellar dust 56 gamma ray burst 56 interferometric 56 ionized gas 56 Saturn rings 56 Eta Carinae 56 spatial dimensions 56 planetesimals 56 optical microscopy 56 nebula 56 WFPC2 56 dwarf galaxies 56 supernovae 56 isotropic 56 WFC3 56 spectrographs 56 Andromeda galaxy 56 spiral galaxies 56 luminosity 56 supernova remnant 56 interferometry 55 aurorae