| A | B |
|---|
| astronaut | A person, often American, trained to go up in a space craft. |
| capsule | A small pressurized compartment. |
| cosmonaut | An astronaut of the Soviet or Russian space program |
| maneuver | To move about in space: A controlled change in movement or direction. |
| module | A part of a spacecraft which does a task and is complete in itself. |
| multi-stage | Having two or more rockets, used one after another. |
| re-entry | To return a spacecraft to the Earth's atmosphere. |
| accelerate | To change speed, usually to go faster and faster. |
| satellite | Any object which orbits the Earth. |
| suborbital | A flight into space which does not complete an orbit around the Earth. |
| Yuri Gagarin | First human being to orbit the Earth. |
| Alan B. Shepard | First American to go to space. |
| John H. Glenn | First American to orbit the Earth. |
| Alexei Leonov | First human being to "walk" in space. |
| Edward White | First American to "walk" in space, he died in Apollo 1. |
| Gus Grissom | This Mercury astronaut died in the Apollo 1 launchpad fire. |
| Neil Armstrong | First man on the Moon. |
| Edwin "Buzz" Aldrin | Second man on the Moon. |
| John Young | The pilot of the first space shuttle launch. |
| Robert Crippen | The copilot of the first space shuttle launch. |
| Sputnik 1 | The first artificial satellite to orbit the Earth. |
| Sputnik 2 | The first satellite to carry a living creature. |
| Laika | The first living creature to go to space from Earth. |
| Mercury program | The first manned U.S. space program. |
| Gemini program | The second manned U.S. space program, with two astronauts per capsule. |
| Apollo program | The U.S. Moon program. |
| shuttle | A ship which goes back and forth from Earth to orbit. |
| Columbia | The first U.S. space shuttle. |
| Challenger | The space shuttle which exploded on launch in 1986. |
| NASA | The U.S. space agency. |
| Apollo 1 | The launchpad fire which killed White, Grissom, and Chaffee. |
| Apollo 8 | The first U.S. mission to orbit the Moon. |
| Apollo 11 | The first mission to land a human being on the Moon. |
| Eagle | The name of the lunar module or LM which first landed on the Moon. |
| Vostok | The ship which carred the first human being in orbit. |
| Voskhod | The name of the ship which carried the first human being to "walk" in space. |
| Isaac Newton | This mathematician formulated the laws of motion. |
| Konstantin Tsiolkovsky | Russian scientist who realized that rockets could solve the problem of power. |
| Robert Goddard | American scientist who tested early liquid-powered rockets. |
| V-2 | A World War II German war rocket which almost went into space. |
