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 stellar disk of the Milky Way Galaxy is approximately 100,000 light-years (9Ã1017 km) (6Ã1017 mi) in diameter, and is considered to be, on average, about 1,000 light-years (9Ã1015 km) thick. It is estimated to contain at least 200 billion stars and possibly up to 400 billion. 1 person found this useful.