| A | B |
|---|
| Deep Space | Everything outside our solar system. |
| Black Hole | The core of a massive star that's exploded. |
| Astronomers | Scientists who study planets, stars and galaxies. |
| Nebula | A cloud of dust and gas that appears as a bright or dark patch. |
| Cosmos | The universe. |
| Light-year | The distance that light travels in a year. |
| Gravity | The force that draws objects toward the center of Earth. |
| Universe | All things that exist in space. |
| Astronaut | A person that is trained to work in space. |
| Galaxy | A large collection of stars, planets, gas and dust. |
| Supernova | The death explosion of a massive star. |
| Constellation | A group of stars that form a shape. |
