antiearth
carbon planet
exoearth
sphereless
Russell's teapot
Proserpina
worldlet
nonearthbound
Chaos
earth
quasi-planet
nonplanetary
biplanetary
nonorbital
Fermi paradox
noncelestial
uncelestial
nongalactic
globe
nonastronomical
Briseis
exoplanet
nonhydrogenous
globeless
flat-earthism
Earthless
pyloroduodenal
nonplanet
planetoidal
unoceanic
counter-earth
overskies
Planet X
nonoceanic
firmament
vault of heaven
refranation
empyrean
sphere
welkin
celestial sphere
heavens
hollow earther
exoring
noncarboniferous
contact
oxazaphospholidine
unfossilizable
nongravitational
semisquare
nonstratospheric
azonane
offworld
nongeophysical
carbon-free
extraterrestrially
nonspherical
unglobed
Kagoshima
globe-earther
earthbound
biogeology
nonplutonic
exoplanetary
diphosphirane
unmeteoric
flat-earth
nontectonic
Vulcan
nonmeteoric
deplanetize
subplanetary
Eridian
celestial pole
nonfossil
planetless
cumulonimbus flammagenitus
ungeological
multiplanet
nongeological
globate
meteor
wandering star
globetard
Aphrodisian
Mercury
meteoroid
astrogeography
xenogeography
unsaturnine
circumplanetary
unscientific
phosphole
microplanetoid
Theia
nonvulcanizable
planetary body
exogeomorphology

English words for 'A hypothetical twin planet to earth, proposed by the Pythagoreans, which cannot be seen from earth.'

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