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Grade 5 D-1 Sci. Def
Chapter 1 Earth, Moon, and Beyond
Term | Definition |
---|---|
revolve | The closed path an object such as the Earth makes as it moves around another object |
orbit | The path one body in space takes as it revolves around another body; such as Earth as it revolves around the sun |
rotate | The spinning of Earth on its axis |
axis | An imaginary line that passes through Earth's center and its North and South poles |
eclipse | The passing of one object through the shadow of another |
solstice | Point in Earth's orbit at which the hours of daylight are at their greatest or fewest |
equinox | Point in Earth's orbit at which the hours of daylight and darkness are equal |
planets | Large, round bodies that revolve around a star. |
asteroids | Chunks of rock that look like giant potatoes in space |
comets | Balls of ice and rock that circle the sun from two regions beyond the orbit of Pluto |
telescope | An instrument that magnifies distant objects |
satellite | A natural body |
space probe | A robot vehicle used to explore deep space |