| A | B |
|---|
| Neil Armstrong | The first man to set foot on the moon |
| Sir Isaac Newton | The man who first saw colors in white light |
| Yuri Gagarin | The first man to travel in space |
| John Glenn | The first American to orbit the earth |
| Robert Goddard | The man known as the “Father of Modern Rocketry” |
| nebulae | Large clouds of gas and dust floating in space |
| Sirius | Brightest star in the night sky |
| corona | The hottest region of the sun’s atmosphere |
| core | The hot center of the sun |
| galaxy | A star system containing from millions to billions of stars |
| Polaris | The North Star. Found in the constellation Ursa Minor |
