Across
- 2. a process where small atoms combine to form a larger one, releasing energy
- 4. a well-tested explanation about how something in space works, like how planets form or how the universe began
- 5. the rising and falling of ocean water on Earth caused by the gravitational pull of the Moon and the Sun
- 7. the study of space, including planets, stars, moons, and everything beyond Earth
- 9. a huge system of stars, planets, gas, and dust held together by gravity
- 11. extremely large in size, like a huge planet or a massive star
- 12. a large cloud of gas and dust in space where new stars can form
Down
- 1. the force that pulls objects toward each other, keeping planets in orbit around the Sun
- 3. a temperature scale used to measure how hot or cold something is
- 6. what is normal or expected, like a planet having an orbit and gravity
- 8. having a large amount of matter or mass, like a black hole or a giant planet
- 10. the path an object follows as it moves around another object in space