| A | B |
|---|
| revolve | to travel in a closed path |
| orbit | the path that a body follows as it revolves |
| rotate | to spin on an axis |
| axis | imaginary line that passes through the poles of the earth or moon |
| eclipse | event in which one object passes through the shadow of another object |
| solstice | a point in the Earths orbit in which the daylight hours are the longest or the shortest, occurs in summer and winter |
| equinox | the poin in the Earths orbit when daylight and darkness are equal, occurs in fall, and spring |
| planets | large round bodies that revolve around a star, there are 9 in our solar system |
| asteroids | chunks of rock that range in size from planets to basketballs |
| comets | balls of ice and rocket that circle the sun from regions beyond Pluto |
| telescope | instrument that magnifies or makes larger distant objects |
| satellite | natural or artificial body that orbits another object |
| space probe | a robot vehicle used to explore deep space |
| ellipse | shape that is not quite circular |
| lunar eclipse | occurs when the full moon passes throught the shadow of earth |
| sloar eclipse | occurs when the Earth passes through the shadow of the moon |
| space shuttle | object that is operated by humans and is used to carry cargo into space and provide a temporary lab work staion while in space to carry out research |
| John Glenn | 1st American man to orbit Earth in a Mercury orbiter |
| Neil Armstrong | 1st American man to step foot on the moon |
| John F. Kennedy | the U. S. President who encouraged the exploration of space |
