| Hubble classification | |
| —n | |
| a method of classifying galaxies depending on whether they are elliptical, spiral, barred spiral, or irregular | |
| [C20: named after Edwin Powell | |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
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