Related terms:
project blue book
hynek
green fireballs
extraterrestrial hypothesis
oberth
ruppelt
sturrock
ufo reports
cnes
ufo sightings
condon report
ufo studies
about ufos
debunker
flying objects
ufo research
ufologists
lapaz
kenneth arnold
ipu
project sign
unidentified flying object
robertson panel
ufo incident
ufology
ufos
flying saucers
socorro
condon
eth
Wikipedia sources:
J. Allen Hynek
Unidentified flying object
Ufology
Green fireballs
Close Encounters of the Third Kind
Extraterrestrial hypothesis
Context for words:
allen
hynek
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