Galaxy Classification. Edwin Hubble was the first person to establish the distances to other galaxies. Because he studied so many galaxies, he began to classify them into different types. The shape and color of a galaxy tell us a lot about the events that have happened within that galaxy.
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M110 in Andromeda, a dwarf elliptical
galaxy of E6 type.
M104 – the Sombrero Galaxy, an Sa type,large nucleus & very tight spiral arms.
The Andromeda Galaxy, M81, is a type Sb.It has a medium nucleus & less tight arms.
This is NGC