Related by context. Frequent words. (Click for all words.) 63 supernovae 63 galaxy clusters 63 gravitational waves 63 cosmic microwave background 62 XMM Newton 62 distant galaxies 62 quasars 61 quasar 61 redshift 61 magnetic fields 60 astronomers 60 spectroscopic 60 NASA Chandra 60 Einstein theory 60 X ray Observatory 60 extrasolar planets 60 general relativity 59 neutrinos 59 cosmologists 59 quantum mechanical 59 adaptive optics 59 cosmic ray 59 diffraction 58 spectroscopy 58 dwarf galaxies 57 astrophysicists 57 gamma ray burst 57 astrophysical 57 neutron star 57 supernovas 57 gamma ray bursts 57 WMAP 57 exoplanets 57 Raman spectroscopy 56 neutrino 56 photons 56 supernova 56 infrared wavelengths 56 distant galaxy 56 galaxies 56 Very Large Telescope 56 neutron stars 56 gravitational 55 gamma rays 55 dynamical 55 auroras 55 quantum mechanics 55 Spitzer Space Telescope 55 pulsars 55 cosmic rays 55 Saturn rings 55 planets orbiting 55 brown dwarfs 55 rocky planets 54 exoplanet 54 interferometer 54 metamaterials 54 pulsar 53 laser pulses 53 ionosphere 53 parallax 53 planets 53 planet orbiting 53 nebula 53 supermassive black holes 53 CMEs 53 waveguides 52 quantum dots 52 molecular dynamics 52 heliosphere 52 magnetosphere 52 Astrophysical Journal 52 particle accelerators 52 luminosity 52 photon 52 cosmological 52 infrared radiation 52 spectra 52 electron microscopy 52 magnetization 52 gamma ray 52 nanostructure 52 solar flares 52 aurora 52 filaments 52 cosmology 51 quantum theory 51 metamaterial 51 spiral galaxy 51 celestial bodies 51 telescopes 51 sunspots 51 nanocrystals 51 albedo 51 atoms 51 X ray crystallography 51 laser pulse 51 physicists 51 nebulae 51 superconductivity 50 brown dwarf