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The Big Bang

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Figure 14
(a) courtesy of Uppsala University; (b) Hale Observatories ©
(a) courtesy of Uppsala University; (b) Hale Observatories
Figure 14 (a) Nebula NGC 6514, a cloud of gas and dust in our own Galaxy; (b) Hubble showed that objects like M31 (NGC 224, now called the Andromeda galaxy) were galaxies like our own, and they ceased to be called nebulae. The two large bright patches near M31 are satellite galaxies, NGC 205 and NGC 221

 4.1 Hubble's discoveries