Related by context. Frequent words. (Click for all words.) 56 spectrum 55 wavelengths 52 infrared wavelengths 52 infrared radiation 51 ionosphere 51 terahertz 50 radio frequencies 50 infrared 49 wavelength 49 THz 48 frequencies 47 electromagnetic waves 47 magnetosphere 46 battlespace 46 millimeter wave 46 MHz frequency 46 #GHz [002] 45 spectrums 45 #MHz spectrum [001] 45 laser pulses 44 distant galaxies 44 infrared laser 44 cosmic ray 44 gamma rays 44 Ka band 44 spectral 44 photons 44 magnetic fields 43 bandwidths 43 GHz frequency 42 redshift 42 electromagnetic 42 excitation 42 diffraction 42 metamaterial 42 interstellar space 42 spectral efficiency 42 narrowband 42 MHz spectrum 42 electrons 42 metamaterials 41 photon 41 quasars 41 gamma ray burst 41 electromagnetic radiation 41 cosmic rays 41 MHz 41 satellites 40 penumbra 40 waveguide 40 gamma ray 40 terrestrial 40 pulsars 40 galaxies 40 spectra 40 ultraviolet 40 galaxy clusters 40 gamma ray bursts 39 gigahertz 39 orbiting satellites 39 electron 39 tunable 39 satellite constellation 39 GHz spectrum 39 radio frequency 39 waveguides 39 spectroscopy 39 microwaves 38 photonic 38 universe 38 outer space 38 spatial resolution 38 GPS satellites 38 megahertz 38 cosmos 38 ultraviolet light 38 #.#GHz spectrum 38 infra red 38 extrasolar planets 37 radio frequency RF 37 orbital 37 polar 37 laser pulse 37 qubit 37 phased array 37 optical fibers 37 spectroscopic 37 atoms 37 habitable zone 37 frequency 37 neutrino 37 photonics 37 UVB 37 GHz 37 airwaves 37 resonators 37 #MHz [001] 37 orbits 37 exoplanet 36 optical 36 UHF