Related by context. Frequent words. (Click for all words.) 65 laser beams 58 laser beam 57 lasers 55 Ultraviolet light 54 laser pulses 54 Photons 53 gamma rays 52 infrared beam 52 electromagnetic waves 51 electron beams 50 laser pulse 50 laser 49 infrared radiation 48 cosmic rays 48 flashbulb 48 strobes 48 visible wavelengths 48 infrared laser 48 shorter wavelengths 48 photons 48 Gamma ray bursts 48 Flashing lights 48 reflective surfaces 47 X ray beam 47 ultrasonic waves 47 meteoroids 47 rays 47 ionosphere 47 infrared 47 terahertz radiation 47 strobe 47 alpha particles 46 magnetic fields 46 auroral 46 ultra violet rays 46 wavelengths 46 fireballs 46 photonic crystal 46 particle beams 46 solar flares 46 coronal mass ejections 46 infrared rays 46 photon 45 ultraviolet 45 gamma ray 45 interferometry 45 airstream 45 auroras 45 excitons 45 blinding 45 hyperspace 45 beams 45 infra red 45 spinning blades 45 apertures 45 infrared detectors 45 cosmic radiation 45 plasmons 45 thunderclouds 45 X ray emission 44 gamma ray burst 44 Unmanned aircraft 44 prisms 44 cosmic ray 44 ultraviolet light 44 microwave frequencies 44 sunbeams 44 femtosecond laser 44 tracers 44 UV light 44 particle beam 44 diffraction 44 detectors 44 sun rays 44 radiations 44 parallax 44 electromagnetic 44 Quantum dots 44 searchlights 44 smoke plumes 44 electromagnetic radiation 43 tracer bullets 43 gamma radiation 43 strobe light 43 detector 43 ionized gas 43 fluorescent dyes 43 Sunspots 43 vignetting 43 strobing 43 solar corona 43 atomic particles 43 Neutrinos 43 interplanetary spacecraft 43 particles 43 missles 43 CMEs 43 Thick clouds 43 emitted 43 ionospheric 43 starbursts