Disc galaxies are galaxies characterized by a disc, a flattened circular volume of stars. These galaxies may or may not include a central non-disc-like region (a galactic bulge).
Disc galaxy types include:
- spiral galaxies
- unbarred spiral galaxies (types S, SA)
- barred spiral galaxies (type SB)
- intermediate spiral galaxies (type SAB)
- lenticular galaxies (types E8, S0, SA0, SB0, SAB0)
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Famous quotes containing the words disk and/or galaxies:
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This maple burn itself away;
Unloved, the sun-flower, shining fair,
Ray round with flames her disk of seed,
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With summer spice the humming air;”
—Alfred Tennyson (1809–1892)
“Don’t you see what’s at stake here? The ultimate aim of all science—to penetrate the unknown. Do you realize we know less about the earth we live on than about the stars and the galaxies of outer space? The greatest mystery is right here, right under our feet.”
—Walter Reisch (1903–1963)