| A | B |
|---|
| revolve | to travel in a closed path around an object |
| rotates | spinning of Earth on an axis |
| axis | imaginary line that passes through Earth's center |
| maria | dark, flat areas on the moon |
| equinox | a point in the Earth's orbit at which daylight and darkness are equal |
| asteroid | chunks of rock in space |
| telescope | an instrument that magnifies distant objects |
| space probe | a robot vehicle used to explore deep space |
| orbit | the path the Earth takes as it revolves |
| ellipse | a shape not quite circular |
| solstice | a point in Earth's orbit at which daylight hours are at their greatest |
| planet | large, round bodies that revolve around a star |
| comets | balls of ice and rock that circle the sun, has a tail of gas |
| satellite | a natural body, like the moon that orbits another object |
| observatory | a place for viewing the stars and planets |
| eclipse | when one object passes through the shadow of another |
