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Questions and Answers
The Milky Way galaxy has exactly 100 billion stars.
False
The oldest known star is thought to be 10 billion years old.
False
The shape of the Milky Way is a perfect circle.
False
There are only three major spiral arms in the Milky Way galaxy.
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The dark areas between the spiral arms are called black holes.
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The Sun is the largest star in our solar system.
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The Milky Way galaxy is the only galaxy in the universe.
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The gas clouds in the Milky Way galaxy are empty and do not contain any matter.
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Study Notes
The Milky Way Galaxy
- Our galaxy, the Milky Way, contains hundreds of billions of stars.
Galaxy Structure
- The Milky Way has a barred spiral shape, with a bar across its center connecting the spiral arms.
- Galaxies come in different shapes.
Center of the Galaxy
- A black hole lies at the center of our galaxy.
- Nothing, including light, can escape from a black hole.
Solar System
- Our solar system consists of eight planets, around 170 moons, and millions of asteroids and comets.
- The solar system orbits around the star we call the Sun.
Star Formation
- Huge gas clouds exist in our galaxy.
- Stars form within these gas clouds, lighting them up.
Galaxy Composition
- The galaxy has four major spiral arms containing stars, gas, and dust.
- Dark areas between the spiral arms, known as nebulae, are composed of dust clouds.
Stars
- The oldest known star is approximately 13.2 billion years old.
- Supergiants are the largest type of stars.
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Description
Learn about the structure and features of our galaxy, the Milky Way, and its place in the universe.
