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Unit 8 Space
| Term | Definition |
|---|---|
| Solar System | The Sun and the planets and other objects that orbit the Sun. |
| Planet | A large body in space that orbits a star and does not produce light on its own. |
| Orbit | A path of an object as it circles around another object in outer space. |
| Gravity | A natural force that pulls two objects toward one another. |
| Moon | A natural object that revolves around a planet. |
| Asteroid | A rocky object that orbits the Sun, found mostly in the region between Mars and Jupiter. |
| Comet | A small object in space that orbits a star and is made of ice, dust particles, and frozen gases. |
| Sun | Our Solar System's star that is made of hydrogen and helium gases, and supplies the heat and light that sustains life on Earth -a yellow dwarf star (considered an average sized star) -Earth is 93 million miles from the Sun |
| Meteor | A piece of rock or metal from space that enters Earth's atmosphere. |
| Revolve | The movement of an object around another object. The earth revolves around the sun. |
| Rotation | When an object SPINS on its axis. |
| Meteorite | When a meteor lands on the Earth's surface |
| Star | A huge ball of gases that makes its own heat and light -billions and billions of stars are in the universe -different sizes and colors -our Sun is a star |
| Asteroid Belt | A disc in the solar system, located between the orbits of Mars and Jupiter, where millions of different sized asteroids orbit the Sun. |
| The moon | Not a planet but orbits the Earth, 238,900 miles from Earth. |
| Milky Way Galaxy | -the galaxy where our solar system is located (we are one of billions!) -estimated to have up to 400 billion stars! -estimated to have up to 100 billion planets! |
| Venus | -the 2nd planet from the sun -closest planet to EARTH -the hottest planet |
| Earth | -3rd planet from the sun -our home -only known planet to support life in our solar system |
| Mars | -4th planet from the sun -called the Red Planet -second smallest planet -has largest mountain in the solar system |
| Jupiter | -5th planet from the sun -largest planet in our solar system -gas giant -known for it's Great Red Spot -79 moons |
| Saturn | -6th planet from the sun -second largest planet -gas giant -known for it's rings |
| Uranus | -7th planet from the sun -third largest -considered an "ice giant" -light blue in color -rotates on it's side |
| Neptune | -8th planet from the sun -farthest planet from the sun -dark blue -"ice giant" -coldest planet -fastest recorded winds in the solar system (1,300mph!) |
| Mercury | -1st and closest planet to the sun -the fastest planet -the smallest planet |
| Pluto | -once was the 9th planet in our Solar System but is now considered a dwarf planet. It is the largest dwarf planet in our Solar System. |