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Earth Sun Moon Vocab
Key Vocabulary for Space Systems Lessons 1 and 2
| Term | Definition |
|---|---|
| Moon | a natural satelllite that orbits a planet |
| Star | a luminous sphere of plasma held together by its own gravity |
| Planet | An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit. |
| Models | A 3D representation of a person, thing, or structure that si typically too big or too small to study |
| Scale | The relative size or distance of something compared to something else |
| System | a set of connected things or parts forming a complex whole (ex: our solar system includes the planets, moons, and asteroids that orbit the central sun) |
| Galaxy | a huge collection of gas, dust, and billions of stars and their solar systems all held together by gravity |
| Gravity | the universal force of attraction acting between all matter |
| Rotation | The spinning motion of a planet on its axis (results in day/night). |
| Revolution | The movement of an object around another object (results in a planet's year as it goes around the sun). |
| Orbit | The path of an object as it revolves around another object in space. |
| Illuminate | to light up or make visible |
| Moon Phases | the different shapes of the illuminated portion of the Moon as seen from Earth |
| Luncar Eclipse | Occurs when Earth passes directly between the Sun and the Moon, casting a shadow on the Moon. |
| Solar Eclipse | Occurs when the Moon passes between Earth and the Sun, blocking all or a portion of the Sun's light from reaching Earth. |
| Seasons | The four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours. Caused by the Earth's tilt and revolution. |
| Order of Planets from closet to the Sun t farthest | Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune |