Related terms:
ngc
protostar
star
aquarius
accretion
outer layers
milky way
sagittarius
neutron star
white dwarf
spectral type
massive stars
nucleosynthesis
stellar evolution
chandrasekhar limit
constellation
asymptotic giant branch
electron degeneracy pressure
Wikipedia sources:
Helix Nebula
Astronomy
White dwarf
Stellar evolution
Aquila (constellation)
Formation and evolution of the Solar System
Context for words:
planetary
nebula
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