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Words semantically related to '
nebulae
' are:
planetary
Nebula
galaxies
ionized
Messier
Herschel
Hubble
NGC
diffuse
Milky
globular
interstellar
clusters
spectroscopic
astronomers
emission
gaseous
stellar
catalogued
spectra
luminosity
spiral
Huggins
faint
catalogue
Heber
telescopes
Andromeda
Comets
Galactic
spectral
elliptical
astronomical
brightest
cosmological
telescope
wavelengths
brightness
universes
Lick
Harlow
constellation
Galaxy
planets
emitted
clouds
reflection
asteroids
catalogues
bipolar
supernova
observable
Orion
astronomer
ultraviolet
observations
helium
enriched
catalog
ejected
brighter
Kant
stars
objects
dust
astronomy
Observatory
spherical
infrared
Edwin
filters
discoveries
hydrogen
Comet
celestial
observing
distant
bright
knots
coma
distances
observed
Sky
dense
gases
magnitude
detected
spectrum
visible
cloud
observers
hemisphere
cluster
masses
expanding
revealing
Star
binary
shapes
variable