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There are two popular versions and stories to this:
The first explanation and the one that is controversial but taught in school is known as the "Big Bang Theory."
For a better explanation on this, you can go to http://en.wikipedia.org/wiki/Big_Bang
The other popular belief which varies from religion to religion but is basically the same is the belief that God created every living creature and everything worldly
What else can I help you with?
What are the waves that are produced by stars and galaxies?
Density waves (they cause the spiral arms in disc galaxies).
What is the major force in universe?
Gravity is considered to be the major force in the universe, governing the motion of planets, stars, and galaxies.
What force is the greatest?
The gravitational force is the greatest force in the universe. It is responsible for holding together galaxies, stars, planets, and all celestial bodies.
Which stars are actually a galaxy?
No stars are actually a galaxy. All stars are stars and all galaxies are galaxies. Stars are found in galaxies. Some galaxies look like tiny dots in our night sky, so might look like a star, but they are not stars; they are galaxies.
What are all stars and galaxies in?
All stars and galaxies are in the universe.
Are there any stars between Galaxies?
Yes, there are stars between galaxies. When there are collisions or interactions between galaxies, stars can be ripped out of the galaxies. These stars will then wander into space between galaxies. Such stars have been observed with the Hubble Space Telescope. Taken from http://curious.astro.cornell.edu/question.php?number=384
Do Galaxies contain millions of stars?
Smaller galaxies do. Larger galaxies contain billions or even trillions of stars.
Which objects began to form in your universe earlier stars or galaxies?
Galaxies are the massive collection of stars. Therefore galaxies could not have formed without stars.
Is your sun and other stars far away in another galaxy too far to feel a gravitational force between them?
Galaxies do exert significant gravitational attraction on other galaxies. For example, the Greater and the Lesser Magellanic Clouds are galaxies that orbit our own galaxy, the Milky Way. In that sense, the stars in one galaxy do have a gravitational interaction with those in other galaxies. Of course, the more distant galaxies have correspondingly less gravitational interaction with ours.
How are galaxies and stars related?
Stars and Galaxies are related because a galaxy is a system of billions of stars, gases, and dust.
When galaxies collided they form?
Bigger galaxies. And stars.
Can galaxies be formed by groups of stars?
Galaxies ARE groups of stars. Lots of stars though. Not just like 2 or 3...
