Related by context. Frequent words. (Click for all words.) 57 solar corona 56 redshift 55 tropopause 54 photosphere 54 redshifts 54 infrared wavelength 54 planetary nebulae 54 Cepheids 54 Mini SAR 53 interferometers 53 active galactic nuclei 53 metallicity 53 Keck telescope 53 upper troposphere 53 tropospheric 52 geoid 52 interferometric 52 anisotropy 52 LOFAR 52 infrared wavelengths 52 keV 52 GeV 52 exosphere 52 optical wavelengths 52 spectroscopic 51 photometry 51 spectral 51 z = 51 XMM Newton 51 visible wavelengths 51 cm -1 51 Exoplanet 51 photoluminescence 51 Mauna Kea Hawaii 51 photometer 51 mesosphere 51 Diviner 51 oxygen isotope 51 Spectrometers 51 interstellar clouds 51 X ray emission 51 aerosol particles 50 stimulated emission 50 amplitudes 50 muon 50 elemental composition 50 lunar craters 50 plasmon 50 noctilucent clouds 50 WASP #b 50 supernova remnants 50 HD #b [002] 50 solar irradiance 50 latitudinal 50 gravitational lens 50 Wilkinson Microwave Anisotropy Probe 50 nebulas 50 La Silla Chile 50 diffraction pattern 49 Very Large Array 49 galaxy clusters 49 ionospheric 49 galaxy cluster 49 wavelengths 49 Magellanic Clouds 49 cirrus clouds 49 gravitational lensing 49 supernova remnant 49 Subaru Telescope 49 excitations 49 kelvin 49 icy moons 49 troposphere 49 ultraviolet wavelengths 49 MeV 49 electron density 49 laser pulses 49 VIRTIS 49 Eagle Nebula 49 Crab Nebula 49 coronagraph 49 quasars 49 shorter wavelengths 48 nebulae 48 astrophysical 48 superlens 48 red supergiant 48 haloes 48 cirrus 48 stellar nurseries 48 distant galaxies 48 reflectance 48 ellipsoid 48 constellation Virgo 48 TrES 48 spectrographs 48 magnetars 48 observable universe 48 interferometer 48 protostar 48 protoplanetary disks