Definition of thanksgiving for English Language Learners. Thanksgiving : the fourth Thursday in November in the U.S. or the second Monday in October in Canada celebrated as a legal holiday for people to be thankful for what they have.
A galaxy contains stars, gas and dust. In a spiral galaxy like the Milky Way, the stars, gas, and dust are organized into a bulge, a disk containing spiral arms, and a halo.. Elliptical galaxies have a bulge-like central region and a halo, but do not have a disk.
Below - three more galaxies in the Leo II groups. NGC 3607 (left) is a large elliptical galaxy and the brightest galaxy among the Leo II groups. NGC 3664 (centre) is an irregular galaxy with a central bar and one spiral arm. NGC 3686 (right) is a barred spiral galaxy.