Related by context. Frequent words. (Click for all words.) 51 ray 42 blue violet 41 rays 40 ultraviolet UV 38 visible wavelengths 38 infrared 38 X ray emission 37 photon 37 suns 37 ionized gas 37 planetary nebula 36 phosphorescence 36 shorter wavelength 36 electron beams 35 gamma rays 35 laser pulse 35 blu 35 starbursts 35 Andromeda Galaxy 35 supernova explosions 35 ionizing 35 photons 35 laser beams 35 Photons 34 lasers 34 Ultraviolet 34 antiprotons 34 laser 34 Crab Nebula 34 distant galaxy 34 infrared radiation 34 optic 34 Interview Richardson 34 cyan 34 Active Denial System 33 illuminator 33 infra red 33 positrons 33 Orion Nebula 33 accretion disk 33 ultraviolet 33 Betelgeuse 33 sun ultraviolet rays 33 ultra violet 33 infrared laser 33 nebula 33 planetoid 32 light emitting diodes LEDs 32 planets orbiting 32 distant galaxies 32 neutrons 32 illumination 32 neutrinos 32 strobe 32 anemones 32 supernova remnants 32 glimmering 32 xenon 32 unaided eye 31 fluorescence 31 UVB radiation 31 nova 31 nebulae 31 X ray beam 31 UV 31 bioluminescent 31 ultraviolet light 31 Earth magnetosphere 31 sunrays 31 glimmer 31 orb 31 Saturn moon Enceladus 31 Procyon 31 fluorescent lamp 31 UV light 31 orbs 31 luminescent 30 dinoflagellates 30 luminosity 30 infrared wavelengths 30 wavelengths 30 haloes 30 WIMPs 30 magnifying lens 30 reddish hue 30 ultra violet light 30 Leonid meteor shower 30 laser beam 30 constellation Leo 30 infrared rays 30 wintry showers 29 sunshine 29 glows 29 luminescence 29 Perseid meteor shower 29 aurora 29 terminator 29 bluish 29 star gazers 29 sea anemone 29 magnetosphere