Across
- 4. The very top layer or outside part of a planet, moon, or star.
- 5. It's the invisible pull that keeps your feet on Earth and planets around the Sun.
- 7. What everything in the universe is made of, from stars to tiny dust.
- 9. A scientist who uses telescopes to study stars, planets, and galaxies.
- 10. When something is one of a kind, like our planet Earth in the solar system.
Down
- 1. A robot machine sent far away to explore and send back pictures of distant planets.
- 2. How much space is between two objects, like Earth and the Moon.
- 3. The special path a planet or moon takes around a larger object.
- 6. The measurement straight across the middle of a planet or moon.
- 8. A big bowl-shaped hole made when an asteroid or meteor hits a planet.