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Solar System Notes Solar System- A group of planets, moons and other satellites that orbit around a star. The Sun-the most important object in our solar system. Our sun provides light and heat for earth Our sun is a star When the sun rises and sets it looks like it is moving but it is not actually moving E.Q. Why is the sun the most important object in our solar system? Seasons: Are caused by the Earth revolving around the sun and the tilt of the earth on its axis Revolution- The earth goes around the sun. It takes 365 days to complete 1 revolution. Axis- Imaginary line that runs through the center of the earth. The earth rotates around it. Orbit- The path a planet takes around the sun. Day and Night is caused by Earth’s rotation around its axis Rotation- The earth spinning on its axis –it takes 24 hours for the earth to rotate once. Study Jam Video-Seasons Earth Notes: Earth is the only planet to have a water source that is usable Earth is the perfect distance from the sun so that we don’t freeze or burn Earth has the perfect amount of gravity Earth is the only planet to support life Moon Notes: The moons gravity causes earths tides On the moon we weigh less because the pull of gravity is less The light the moon has is really a reflection of the sun’s light New Moon-looks invisible Full Moon- is full of light Waxing Moon-Appears to be getting bigger-right side Waning Moon-Appears to be getting smaller-left side Constellations-A group of stars that form a pattern or picture Planet Notes Inner Planets- 4 planets closest to the sun Outer Planets-4 planets farthest from the sun