universe contained in ???????
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The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty. However, even places far from stars and planets contain scattered particles of dust or a few hydrogen atoms per cubic centimeter.
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In the last 20 years we’ve discovered that this makes up less than 20% of the total mass of the universe. All the rest of the mass appears to be made of an invisible substance called dark matte
Other Solar Systems
Our Milky Way Galaxy is just one of billions of galaxies in the universe. Within it, there are at least 100 billion stars, and on average, each star has at least one planet orbiting it. This means there are potentially thousands of planetary systems like our solar system within the galaxy!
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