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physical phenomena > process > physical process > motion > mass motion > galaxy motion > galactic rotation

galactic rotation comparison table

Subject	is a kind of	has definition
differential rotation	rotation	As an object rotates, different parts of it may move at different rates. The Galaxy rotates differentially.
galaxy motion	mass motion
galactic rotation	galaxy motion	The revolving of a galaxy round its central nucleus even as it continues its proper motion. Such rotation, however, is not uniform but differential. One revolution of the Sun within our own Galaxy takes about 225 million years, or 1 cosmic year.

Next differential rotation: solar rotation    Up: differential rotation, galaxy motion