Fermi paradox
aliensdidit
exogenesis
anthropic coincidence
Rare Earth hypothesis
hypothesis
theory
possibility
paleocontact hypothesis
ancient astronaut hypothesis
undiscovered
nullibism
black swan
astrobiology
exobiology
space biology
cosmozoa
offworld
quantum suicide
xenoscience
Knightian uncertainty
noncosmic
antiearth
scientific materialism
unscientifically
ancient astronaut
nonterrestrial
nihilism
exoterrene
abiogenesis
pancosmism
sciencey
alien
xenogeology
immaterialism
that's a laugh
nonfossilized
Dollo's law
nonuniverse
fixism
theoretic
inorganic
unscientifical
vitalism
combination problem
unearthly
untheorized
xenoarchaeology
entity
acosmism
cosmicism
antiscientism
xenopaleontology
carbon planet
hypothetical creature
anthropic principle
xenobiology
extraterrestrially
junk science
intelligent design
unscientific
Arecibo message
didit
ultramundane
exocommunication
noncorroborated
sourcelessness
bolide
existencelessness
unfossilizable
materialism
inexplorable
Russell's teapot
implausibility
unexistence
unphysicalness
moral
evolutiondidit
visitor
axenically
evolution of the gaps
amphizoic
cryptobotany
might as well
antiexperimentalism
mare's nest
xenomorphology
atheism
antievolutionist
unreal
outworld
unreality
Sir Karl Raimund Popper
Karl Popper
hollow earther
Copernican principle
Popper
supposed
cryptid

English words for 'The seeming contradiction, serving as a challenge to believers in the existence of advanced lifeforms throughout the universe, that there is no scientific evidence that extraterrestrial civilizations have tried to visit or communicate with Earth.'

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