| A | B |
|---|
| space capsule | the part of the spaceship that holds the astronauts |
| Mission Control | men on earth who watch over a space flight |
| algae | simple green plants |
| recycle | use again |
| constellation | a group of stars that forms a pattern in the sky |
| navigation | finding the way when traveling |
| parallels | imaginary lines running horizontally around the earth |
| meridians | imaginary lines running from the North Pole to the South Pole |
| latitude | the number of degrees by which a place on earth is north or south of the equator |
| longitude | the number of degrees by which a place on earth is east or west of the prime meridian |
