Related by context. Frequent words. (Click for all words.) 57 Fluorescence 45 Terahertz 43 Fluorescent 43 Electromagnetic 42 Spectrometer 42 Detects 41 Detector 40 Detectors 39 Microscopic 39 Detection 38 Infrared 37 electromagnetic 37 muons 36 luminescence 36 multispectral 35 infrared laser 34 Ultra Violet 33 infrared 33 Detected 33 ultra violet light 32 infrared spectrometer 32 detector 32 lasers 32 bioluminescence 32 spectral 32 Scanner 31 gamma ray 30 photometric 30 Thermal imaging 30 thermal imaging camera 30 ESO Very Large Telescope 30 infra red 30 EMF 29 ultra violet 29 detects 29 gamma radiation 29 thermal imagers 29 electro magnetic 28 detectors 28 electromagnetic waves 28 bioluminescent 28 laser beams 28 gravitational wave 28 luminescent 27 infrared camera 27 non invasively 27 thermal imager 26 sensors 26 infrared detectors 25 thermal imaging 25 infrasound 25 strobes 25 detection 25 emitted 25 infrared cameras 25 infrared sensors 24 Very Large Telescope 24 Sonar 24 electromechanical devices 23 detect 23 virtually undetectable 23 electromagnetic fields 23 sonars 23 Invisible 23 thermal imaging cameras 22 detecting 22 detections 22 brainwaves 22 radiation emitted 22 evanescent 21 Very Large Array 21 pulsing 21 strobe light 20 auras 20 exhaled breath 20 Corot 19 strobe lights 19 motes 18 sea anemones 18 detected 17 emitting 17 searchlights 17 lightning flashes 17 emanations 16 Meter 14 motion detectors 14 orbs 13 fingerprint scanners 12 honeypots 11 beacons 11 flickering 11 CCTV cameras 8 ghostlike 8 ghostly 6 poltergeists 6 apparitions 6 phantoms 5 haunting 0 specters 0 ghosts 0 meter