| A | B |
|---|
| orbit | the path one object takes as it travels around another object in space |
| international | involving different countries |
| program | a plan for doing something |
| astronaut | someone trained to travel and work in space |
| goal | something you aim for |
| claim | to say that something is yours |
| challenge | something difficult to do |
| expand | to increase in size |
| equipment | tools used for a certain purpose |
| recycles | uses again |
| source | thing, place, or person from which something comes |
| future | the time to come |
| available | ready to be used |
| expensive | costing a lot of money |
| vehicle | something that carries people or baked goods from one place to another |
| extremely | very much; in a way that is far beyond normal |
| rocky | having or consisting of rocks |
| valuable | worth a great deal |
| product | something that is made to be sold |
| bulky | something that takes up a lot of space |
| thermal | designed to keep heat in |
| ease | to make something less difficult or painful |
