Related by context. Frequent words. (Click for all words.) 68 cosmic microwave background 64 microwave radiation 61 X ray emission 61 solar corona 61 gravitational lensing 60 HD #b [002] 60 photometer 60 WASP #b 60 Hawking radiation 60 interferometry 60 Cosmologists 60 interferometers 60 visible wavelengths 59 astronomical objects 59 shorter wavelengths 59 supernova remnant 59 Oort Cloud 59 redshifts 58 ionosphere 58 optical wavelengths 58 solar nebula 58 redshift 58 active galactic nuclei 57 infrared wavelengths 57 gravitational wave 57 Earth magnetosphere 57 polar vortex 57 gravitational waves 57 cosmic rays 57 microwave frequencies 57 ionospheric 57 photometry 57 infrared radiation 57 -# degrees Fahrenheit [002] 56 planetary nebulae 56 magnetars 56 interstellar dust 56 Crab Nebula 56 interplanetary spacecraft 56 Cepheids 56 magnetar 56 ejecta 56 extrasolar planet 56 anisotropy 56 microlensing 56 cosmic ray 56 quasars 56 solar irradiance 55 heliosheath 55 quasar 55 exoplanet 55 galaxy clusters 55 interferometric 55 ionisation 55 galaxy cluster 55 exciton 55 XMM Newton 55 elemental composition 55 radial velocity 55 magnetic fields 55 Type Ia supernovae 55 subatomic particle 55 Galaxy Evolution 55 magnetic reconnection 55 accretion disk 55 Saturn moon Enceladus 55 distant galaxies 55 muons 55 gamma ray burst 55 Earthlike 54 frequency comb 54 radioactive decay 54 Gamma rays 54 aerosol particles 54 spectroscopic 54 protoplanetary disk 54 ionized gas 54 spectra 54 celestial object 54 Gamma ray bursts 54 comet nucleus 54 excitations 54 muon 54 ionize 54 GRBs 54 GRB # 54 Eta Carinae 54 photonic crystal 54 keV 54 spacetime 54 hot Jupiters 54 meteoroids 54 interstellar medium 54 auroral 54 terahertz radiation 54 radiative 53 ionised 53 magnetosphere 53 decoherence 53 water vapor 53 baryons