Term Definition
Systems a group of parts that work together as a unit
Pattern something that happens in a regular and repeated way
Model a representation of an object or what something looks like
Solar System a group of objects (a system) in space that move around a central star
Star a huge, burning sphere of gases; for example, the Sun
Planet a large object that moves around a star
Astronomer a person who studies stars, planets, and other objects in the sky
Telescope an instrument people use to observe distant objects with their eyes
Rotation the spinning of a planet on its axis
Axis an imaginary line that runs through both poles of a planet
Revolution the action of one object moving around another in an orbital path
Orbit the path an object, such as a planet, takes as it
revolves around a second object
Ellipse the shape of the Earth's orbit around the Sun
Seasons caused by the different hemispheres of the Earth being tilted toward or away from the Sun
Shadow a dark area where light is blocked
Lunar Eclipse occurs when the Moon passes through the Earth’s shadow during a full Moon
Solar Eclipse occurs when Earth passes through the Moon’s shadow during a new Moon
Lunar Cycle the period of time it takes for the Moon to complete one full revolution around Earth
Phases the different shapes the Moon appears to have
in the sky when observed from Earth
Tide repeated rise and fall in the level of the ocean


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