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SECTION in The Work of the Colorado Project
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Air Force aircraft airglow altitude analysis anomalous propagation antenna appeared astronauts astronomical atmosphere azimuth ball lightning balloon base beam birds bolide bright camera Chapter cloud color Colorado project detected diameter direction disappeared distance earth echoes effects event evidence field film flying saucers ground horizon hypothesis identified incident indicated interview inversion investigation layer light magnetic meteor miles mirage motion moving NICAP night observed occur officer operator optical orbit Panel phenomenon photographs physical pilot planet Plate possible present Project Blue Book Project Grudge radar radio radiosonde range reflection refractive index Research result Robertson panel Ruppelt sample satellite scientific Section seen sighters sonic boom spacecraft speed star station surface target temperature temperature inversion tion track Tremonton UFO reports UFO sightings Unidentified Flying Objects velocity visible visual wavelength weather wind witness