| A | B |
|---|
| Aristotle | An Ancient Greek philosopher who said that the Earth is the center of the universe. |
| Copernicus | A scientist who proved mathematically that the Sun is the center of the Solar System. |
| Galileo | He was imprisoned for his beliefs about the Solar System. |
| Newton | He worked with the Laws of Gravity. |
| Jules Verne | An author of space stories during the turn of the century. |
| Phobos and Deimos | The two moons of Mars. |
| ISS | The International Space Station |
| Neil Armstrong | The first man on the moon. |
| Gemini | The name of two manned space flights. |
| John Glenn | The first American to orbit the Earth. |
| The Russians | The first men in space. |
| Ancient Chinese astronomers | They were able to predict eclipses. |
| The Theory of Gravity | The more mass the greater the force and the closer together they are the faster the movement. |
| Kepler | The scientist who discovered that orbits are ellipses. |
| 1649 | Newton was born and Galileo died. |
| 1609 | Galileo built an observatory and discovered that Jupiter had moons. |
