| A | B |
|---|
| orbits | moving in a path in space |
| altitudes | distances above sea level |
| gravity | a natural force pulling objects to the ground |
| lifespan | a lifetime |
| calculate | estimate |
| astronomy | the science of outer space |
| revolving | to turn around something, move in a circle |
| navigation | directional guidance for ships and airplanes |
| military | armed forces |
| monitor | observe over time |
| invaluable | extremely valuable |
| potentially | possibly |
| tissue | a group of animal or plant cells |
| deciphering | figure out the meaning of; interpreting |
| detect | find, discover |
| data | detailed bit of information |
| rotation | turning on an axis or around a center |
| versatile | capable of doing many things |
| repaired | fixed |
| disabled | made unable to function |
| appropriately | suitably; properly; correctly |
