| Term | Definition |
|---|
| Mercury | the smallest planet and the nearest to the sun |
| Venus | the hottest planet and nearest to Earth |
| Earth | the planet with one moon and a atmosphere of mostly nitrogen and oxygen |
| Mars | many robotic missions have been sent to this "Red Planet." |
| Jupiter | this planet is the largest and has to most moons |
| Saturn | the planet that could float on water, due to the fact it is primarily hydrogen |
| Uranus | the planet that is tilted on its side |
| Neptune | the planet whose largest moon is Triton |
| The Sun | the engine of the solar system with a core temperature of 27 million Fahrenheit |
| Ceres | the only dwarf planet in the Asteroid Belt |
| Pluto | the dwarf planet that was once a ninth planet |
| Asteroid Belt | the region of rocky bodies between Mars and Jupiter |
| Kuiper Belt | the region of icy bodies beyon Neptune housing most of the dwarf planets |
| Oort Cloud | the little-known-about region beyond the Kuiper Belt |
| Io | most volcanically active place in the solar system |
| Europa | may harbor life through vast oceans |
| Titan | only moon with a thick atmosphere; Saturn's largest moon |
| Cassini Spacecraft | the probe currently studying Saturn and its moons |
| Voyager Spacecraft 1 & 2 | the spacecraft that journeyed the solar system and are currently somewhere in deep space |
| asteroids | rocky metallic objects that orbit the sun but are too small to be considered a planet |
| celestial | having to do with the sky |
| comets | balls of ice, rock, and dust in space with a tail |
| galaxy | a cluster of stars, dust and gases held together by gravity |
| planets | large bodies that orbit a sun (star) |
| satellites | any object that revolves around another object in space |
| star | hot, glowing ball of gases |
| gravity | the force of attraction between all masses in the universe |
| mass | the property of a body that causes it to have weight in a gravitational field |
| Solar system | the sun with the celestial bodies that revolve around it in its gravitational field |
| constellation | a configuration of stars as seen from the earth |
| milky way galaxy | the galaxy we live in |
| telescope | a magnifier of images of distant objects |
| universe | everything that exists anywhere |
| sun | any star around which a planetary system evolves |
| light year | the distance that light travels in a vacuum in 1 year |
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