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Junko Ueda[who?] observed that galaxy collisions result in disc galaxies, within 40 million light years from the Earth. While the galaxies are interacting, they change shape in cosmic time as they merge.
Disc galaxy types include:
- spiral galaxies
- lenticular galaxies (types E8, S0, SA0, SB0, SAB0)
Galaxies that are not disc types include: