Archive for September, 2011

Cladistics and the Hubble sequence

Hubble discovered galaxies in 1922. He found elliptically shaped objects and disky ones showing spiral arms sometimes with a bar at the center. He also thought that because of Jean’s law, elliptical galaxies would flatten into a disk, so the elliptical galaxies are the most ancestral ones. We can code Hubble’s initial observation with to […]

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