Review Questions
1. Describe the Milky Way. What does it contain?
2. How are galaxies organized and distributed within the universe?
How is gravity important to the galaxies within our universe?
4. How do galaxies vary?
5. What forces shape the stars in galaxies?

Milky way is a galaxy . Milky way has a spiral shape . The Milky Way has a relatively low surface brightness due to the gases and dust that fills the galactic disk. it comprises of dust particles , 200 billion stars.they are bounded into clusters due to gravitational force out there.when you ask how is gravity important to the galaxy within universe then ask what hold the lump of solar system together in this great cosmic soup when whole universe is expanding ? yea , there is gravity . Hravity holds these objects together and today we have a cute solar system .The galaxies are generally observed using shapes - some are eleptical , some are spiral and some are just irregular GRAVITY !!yes , gravity holds the shape of stars in galaxy , gravity helps in keeping thing stable in universe. gravity restricts the moon from flying away in the space as the gravity of earth atttracts it towards itself .

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.