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A Galaxy of Stars
Transcript of A Galaxy of Stars
Our galaxy is called the Milky Way A galaxy is a group of stars where they are formed, live and die! There are about 2,500 stars visible to the naked eye at any one point at any one time on the Earth, and 5,800-8,000 total visible stars. Astronomers estimate that there are 200 billion to 400 billion stars contained within the Milky Way. The Milky Way is a spiral galaxy. Astronomers tend to call five or six stars a "group” and about a hundred a cluster. At some point, a cluster becomes a galaxy. Millions and billions of stars consist in a galaxy; however there never has been an official number. All the stars in our galaxy are held together by gravity, and our galaxies contain hydrogen gas. This hydrogen gas, along with dust, is essential to make more stars and planets. Planets, unlike stars are difficult to find. Stars release energy, making them visible to us. Planets however are very small and don't give any energy of their own. To find a planet, astronomers look for stars, as they (planets) orbit them. Because a star is visible and easy to find, it makes finding planets so much easier. Planets have their own gravity and cause the star to wobble a bit. This wobbling is proof of planets.
There are Four different types of galaxies.
1. Spiral galaxy
2. Barred spiral galaxy
3. Elliptical galaxy
4. Irregular galaxy. Galaxies with less than a billion stars are considered "small galaxies." In our own galaxy, the sun is just one of about 100 billion stars.
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