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.
The halo stars consist of old, faint, red main sequence stars or old, red giant stars, considered to be among the first stars to have formed in the Galaxy. Their distribution in space and their extremely elongated orbits around the center of the Galaxy suggest that they were formed during one of the Galaxy's initial collapse phases.