| Term | Definition |
|---|---|
| astrobiology | the study of the origin, development, distribution, and future of life in the universe. |
| organic | refers to a class of chemical compound in living organisms that are based on carbon. |
| artificial satellite | any human made object placed in orbit around a body in space. |
| rocket | vehicle propelled by the exhaust made from burning fuel. |
| space probe | an un-crewed vehicle that travels to and obtains information about objects in space. |
| microgravity | where the force of gravity is so weak weightlessness occurs. |
| solar radiation | harmful radiation from the sun. |
| AU | Astronomical unit, mean distance of the earth from the sun: approximately 93 million miles. |
| ISS | International space station is an artificial satellite constructed, by astronauts from 15 different nations, that orbits the Earth where people live and work for up to 6 months at a time. It has been continuously occupied since the year 2000. |
