aperture
arcminute
arcsecond
asteroid
blue-shift
CCD (Camera)
comet
declination (Dec)
emission nebula
galaxy
galaxy morphological classification
globular cluster
H-Alpha (Hydrogen-Alpha) Region
H-II Region
HST (Hubble Space Telescope)
ionization
IRAS
Laplace's Nebular Hypothesis
lightyear
LINEAR
Local Group
Lord Rosse
maser
metal (Metallicity)
Milky Way
The Moon
nebula
neutron star
OB stars
open cluster
planetary nebula
red-shift
reflection nebula
right ascension (RA)
ROSAT
spectroscopy
stellar classification
supernova remnant
T Tauri star
ultra-violet
universe
Wolf-Rayet star
X-ray
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