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The Earth and the Stars Presented by: Paula Follett-Comeau What are stars made of? • Stars are mostly hot gases such as hydrogen • Hydrogen gas consists of tiny bits called atoms • The heat inside the star makes the atoms jump about. • The collisions between the atoms produce flashes of light and bursts of heat How many stars can you see on a dark, clear night? • 3,000 with your eyes alone • as many as 600,000 with a small telescope! • There are at least 200 billion, billion stars out in space! Which star is closest to the Earth? • The Sun • it is about 149 million km from us • it is the only star in our solar system How hot is the sun? • Hotter than anything on Earth! • It’s surface is about 5,532C • The inside of the sun is about 13 million C! Which is bigger, the sun or the Earth? • The sun is bigger, by far • it is about 1,384,000 km across; over 100 times the diameter of Earth! • The sun is so huge that more than 1 million Earths could easily fit inside it! What are planets? • A planet is a large celestial body that orbits a star and does not shine on its own. • There are 9 planets in our solar system Do the planets move? • Planets move around the sun in an orbit. • Each planet also spins on its axis. • The planets are moving through the galaxy with the sun. How fast is the Earth moving? • Earth revolves around the sun at a speed of 106,560km an hour! • Earth also rotates-taking 24 hours to make one complete turn. • Not all points on Earth move at the same speed--North Pole spins slowly; around the equator speeds at 1,661 km an hour! Would you like to learn more about astronomy? • Visit the Internet Space Station for lots of learning, games, and fun!