Related by context. Frequent words. (Click for all words.) 54 multispectral 44 Spectrometer 41 ESO Very Large Telescope 41 photometric 39 infrared spectrometer 39 sonars 39 Very Large Telescope 38 thermal imager 38 Fluorescence 36 infra red 35 infrared camera 34 luminescent 34 Infrared 34 Very Large Array 34 infrared 33 ultra violet 32 infrared cameras 32 spectral 31 Microscopic 31 infrared detectors 31 Corot 30 gravitational wave 29 thermal imagers 29 laser beams 29 gamma ray 28 sensors 28 infrared sensors 28 thermal imaging camera 28 beacons 28 ultra violet light 28 meter 27 detector 27 Thermal imaging 27 infrared laser 26 Electromagnetic 26 orbs 26 Fluorescent 26 Detector 26 Ultra Violet 25 Scanner 25 luminescence 25 motes 25 CCTV cameras 25 strobes 25 Detects 25 infrasound 24 detectors 24 Terahertz 24 strobe light 24 lasers 23 electro magnetic 23 Detection 23 electromagnetic waves 23 electromechanical devices 22 gamma radiation 22 Detected 22 Detectors 22 electromagnetic 22 bioluminescence 22 Sonar 21 emitting 21 thermal imaging 21 radiation emitted 21 searchlights 20 honeypots 20 virtually undetectable 20 lightning flashes 20 muons 20 non invasively 20 detections 20 detection 19 flickering 19 bioluminescent 19 sea anemones 19 emitted 19 thermal imaging cameras 18 fingerprint scanners 18 ghostly 17 detects 17 evanescent 17 ghostlike 17 Meter 17 pulsing 17 exhaled breath 16 motion detectors 16 strobe lights 15 auras 15 detect 14 electromagnetic fields 13 detected 13 detecting 13 haunting 12 specters 11 brainwaves 10 phantoms 10 EMF 10 Invisible 9 ghosts 9 apparitions 8 poltergeists 8 emanations