Related terms:
nebulae
hubble
spiral
galaxies
our galaxy
clusters
spiral arms
galactic
big bang
milky way
supercluster
dark matter
barred spiral
rotation curve
spiral nebulae
galaxy rotation
astronomers
galaxy formation
milky way galaxy
andromeda galaxy
globular cluster
elliptical galaxy
clusters of galaxies
Wikipedia sources:
Galaxy
Milky Way
Dark matter
Galaxy formation and evolution
Context for words:
spiral
galaxies
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