Related by context. Frequent words. (Click for all words.) 57 Cepheids 54 photometry 53 planetary nebulae 53 spectroscopic 52 redshifts 52 spectra 52 radial velocity 51 elemental composition 51 WASP #b 51 interferometry 51 anisotropy 51 magnetar 51 Einstein theories 50 Type Ia supernovae 50 z = 50 redshift 49 photometric 49 boson 49 galaxy formation 48 keV 48 photoluminescence 48 π 48 Supernovae 48 globular cluster 48 supernova remnants 48 photometer 47 Fig. 1A 47 morphologies 47 novae 47 excitations 47 substorm 47 solar corona 47 protoplanetary disk 47 FRET 47 gravitational wave 47 Crab Nebula 47 pulsations 47 dynamical 46 Eta Carinae 46 quantitative measurements 46 supernova remnant 46 amplitudes 46 velocities 46 active galactic nuclei 46 subatomic particle 46 ultraviolet wavelengths 46 infrared spectroscopy 46 nanomechanical 46 XMM Newton 45 Keck telescope 45 interferometers 45 GeV 45 MeV 45 absorbance 45 positron 45 Hubble observations 45 brown dwarfs 45 magnetars 45 geoid 45 gravitational lensing 45 HAT P 45 optical wavelengths 45 ESO Very Large Telescope 45 extrasolar planet 45 spectrometry 45 supernovas 44 parallax 44 Fluorescence 44 baryons 44 elliptical galaxies 44 tropospheric 44 globular clusters 44 neutrino 44 abundances 44 GRBs 44 dispersive 44 auroral 44 planet orbiting 44 planets circling 44 ionospheric 44 nebulae 44 Algol 44 interferometric 44 electron density 44 Albireo 44 planet Uranus 44 observable universe 44 magnetization 44 galaxy clusters 44 supernova 44 planet orbits 43 CoRoT 43 supernovae 43 confocal microscopy 43 spectrographs 43 chirality 43 microwave radiation 43 NICMOS 43 electron spins 43 planetary 43 X ray emission