| A | B |
|---|
| planet | a very large round object in space that moves around a star |
| science fiction | stories about space, the future, space travel, etc. |
| actually | really, in truth |
| consider | think about something carefully |
| complex | complicated, difficult to understand or do |
| project | a carefully planned job or work idea |
| balance | equilibrium, equal positions |
| element | a simple chemical substance of only one type of atom |
| unit | a piece, a part, a building |
| discussing | talking about |
| bacteria | very small living things that sometimes cause disease |
| physicist | a scientist who studies physical objects, substances, and natural forces |
| satellite | a machine that was sent into space to assist electronic communications |
| solar | from the sun |
| create | to make something new, to produce |
| carbon dioxide | the gas produced when animals breathe out, when carbon is burned, or when plants decay |
| so far | until now, up to this moment |
| fascinating | very interesting |
