| A | B |
|---|
| refract or bend light to produce an image | refracting telescope |
| uses a dish-shaped mirror as the main light-gathering element of the instrument | reflecting telescope |
| the horizontal or compass direction | azimuth |
| telescopes that "see" in radio wavelengths | radio telescopes |
| Astro-rivelatore Gamma a Immag ini LEggero | AGILE |
| GALaxy Evolution Explorer | GALEX |
| a Russian schoolteacher who eventually became the first theoretical astronautics scientist | Konstantin E. Tsiolkovsky |
| a Romanian-born physicist who mentored Wernher von Braun and developed the idea of multistage rockets | Hermann Oberth |
| a gifted American physicist who made the first real technical advances leading to modern rockets | Rober H. Goddard |
| a German rocket scientist who was influential in developing the rockets of the modern US space program | Wernher von Braun |
| broken satillites or parts of rockets | Space Junk |
| a rover | lander |
| first person in space | Yuri Gagarin |
| first American in space | Alan Shepherd |
| first woman in space | Vallentine |
| first American woman in space | Sally Ride |
| first to orbit the earth | John Glenn |
| first man to step on the moon | Neil Armstrong |
| second man to step on the moon | Edwin Aldrin |
| operated the Apollo 11 rocket | Michael Connors |
| first moon landing mission | Apollo 11 |
| missions to get man to the moon | Apollo |
| the American project to get man to space | Mercury |
| the Apollo 11 rocket | Saturn V |
| the Soviet space project | Gemini |
| National Aeronautics and Space Administration | NASA |
| a special satillite | space station |
| a space station owned by the entire world and mainly operated by the US | International Space Station |
| the first American space station | Skylab |
| the 7 space stations that belong to Russia | Salyut |
| the last space mission | Atlantis |
| rocket that exploded on takeoff | Challenger |
