Answer to Question #54986 in Astronomy | Astrophysics for ashok

Question

Distinguish between spiral and barred spiral galaxies giving examples of each type of
galaxy.

Answer 1

Some spiral galaxies have arms that are wound tightly, while other galaxies have very loosely-wound arms. The difference between tightly and loosely wound spirals is a genuine difference between the galaxies, and can be used to classify spirals.
About 77% of the observed galaxies in the universe are spiral galaxies. Our own galaxy, the Milky Way, is a typical spiral galaxy. The images below show three other good examples.