Across
- 2. A person who studies planets and stars
- 4. A system of government where the people choose their leaders
- 6. A continent where kangaroos are native
- 9. The term for the Earth's movement around the sun
Down
- 1. A shape with 4 equal sides and no right angle
- 3. The imaginary line that divides the Earth into the Northern and Southern Hemispheres
- 5. A natural phenomenon that shows a spectrum of colors in the sky
- 7. A superhero who wields a hammer named Mjölnir
- 8. A famous physicist known for his laws of motion