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Science
4.5 Solar System
| Term | Definition |
|---|---|
| astronomer | is a scientist that studies celestial observations. |
| atmosphere | is the surrounding mixture of gases that surround a planet. |
| gas planet | is a planet with an atmosphere composed of hydrogen and helium. All these planets exist beyond the asteroid belt and have a ring system. Jupiter, Saturn, and Uranus are examples. These planets have many moons revolving around them. |
| orbit | A path described by one body in its revolution about another |
| revolution | is the movement of an orbiting body completely around another object, such as a star or a planet. The Earth circles around the sun in 365.25 days. |
| rotation | is the time it takes for Earth to rotate completely around once on its axis completing a full day (24 hours). It causes day and night to occur. |
| Solar system | is the Sun and all the objects that orbit around it. |
| Terrestrial planets | are planets having a rocky solid composition. These planets have few moons, closer to the sun than gaseous planets, and no ring systems. Mercury, Venus, Earth, and Mars are examples. |