Related by context. Frequent words. (Click for all words.) 70 infrared 65 infrared wavelengths 64 photons 63 wavelengths 62 gamma rays 62 water vapor 61 infra red 58 magnetosphere 58 laser pulses 58 cosmic rays 57 magnetic fields 57 gamma ray burst 57 gravitational waves 57 electromagnetic waves 57 ionosphere 56 ultraviolet light 56 photon 56 UV light 55 ultraviolet 55 sunlight 55 gamma ray 54 diffraction 54 distant galaxies 53 terahertz 53 quasar 53 exoplanets 53 cosmic ray 53 extrasolar planets 53 electromagnetic 53 spectroscopic 53 neutrinos 53 starlight 53 neutrons 53 infrared laser 53 Infrared 52 rays 52 redshift 52 polar regions 52 neutrino 52 electromagnetic spectrum 52 exoplanet 52 electrons 52 sun rays 52 electromagnetic radiation 51 cosmic microwave background 51 luminosity 51 galaxy clusters 51 neutron star 51 quasars 51 fluorescence 51 Spitzer Space Telescope 51 metamaterial 51 electron 51 waveguide 51 spectra 51 vibrational 51 spectrometer 51 UV radiation 51 spectroscopy 51 reflectance 51 troposphere 50 nebula 50 aurora 50 conductivity 50 ions 50 refractive index 50 laser beams 50 gamma ray bursts 50 brown dwarfs 50 ionization 50 albedo 49 ultraviolet rays 49 spectral 49 ultraviolet radiation 49 galaxies 49 brown dwarf 49 laser beam 49 pulsar 49 particles 49 hydrogen atoms 49 comet 49 vortices 49 Saturn rings 49 aerosols 49 spatial resolution 49 supermassive black hole 49 Enceladus 48 atoms 48 electrical currents 48 ambient light 48 wavelength 48 Very Large Telescope 48 radiant heat 48 conductive 48 UV rays 48 subatomic particles 48 infrared camera 48 atomic particles 48 reflectivity 47 asteroids 47 resonator