| A | B |
|---|
| universe | all things; everything there is |
| device | something invented,devised, or fitted for a particular use or special purpose |
| visible | able to be seen |
| satellite | a heavenly body that revolves around a planet or other larger heavenly body. |
| crater | the opening at the top of a volcano |
| gravity | the natural force that casues objects to move or tend to move toward the center of the earth |
| atmosphere | air that surrounds the earth |
| vacuum | an empty space without even air in it |
| oxygen | a gas without color, taste, or odor that forms about one fifth of the air. |
| aluminum | a very light , silver-white metal that does not tarnish easily. |
| old-fashioned | out-of-date |
| manufacture | make by hand or machine. |
| microphone | instrument for magnifying small sounds or for transmitting sounds. |
| machinery | machines |
| project | a plan; scheme |
| horizon | line where earth and sky seem to meet |
| construction | the act of constructing;building; putting together |
| dial | plate or disk with numbers, letters, or marks on it and a moving pointer that shows how much there is of something. |
| electronic | of or having to do with electrons or electronics. |
| progress | advance; growth; development |
