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HUBBLE DISCOVERIES
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REFERENCE DESK
Colliding Galaxies NGC 4038 and 4039
Active Galaxy M87 Jet
Black Hole in Galaxy M84
Quasar Host Galaxies
Gamma Ray Burst GRB990123
Gravitational Lensing in Galaxy Cluster Abell 2218
Cepheid Variable Stars in Galaxy M100
Spiral Galaxy NGC 4414
Distant Supernovae
Hubble Deep Field North
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