Across
- 6. A huge cloud of gas and dust in space where stars are born.
- 7. The idea that the solar system formed from a cloud of gas and dust that collapsed and spun into planets and the Sun.
- 11. A layer of the Sun where hot gases rise and cooler gases sink, moving energy outward.
- 13. Heat energy that’s invisible to our eyes but can be felt and detected with special tools.
- 18. A process where small atoms (like hydrogen) combine to form bigger ones (like helium), releasing energy—how stars shine.
- 19. A giant ball of hot gases that gives off light and heat, like our Sun.
- 20. A measure of how stretched out an orbit is. A perfect circle has zero eccentricity.
- 21. The simplest and most common element in the universe; stars are mostly made of it.
Down
- 1. Rules that describe how planets move around the Sun in oval-shaped orbits and how fast they go.
- 2. The part of the electromagnetic spectrum we can see—like colors of the rainbow.
- 3. A type of invisible light from the Sun that can cause sunburn and is blocked by the ozone layer.
- 4. The center of the Sun where nuclear fusion happens and energy is made.
- 5. The Sun and everything that orbits it—planets, moons, asteroids, and comets.
- 8. Refers to rocky planets like Earth, Mars, Venus, and Mercury.
- 9. Energy from the Sun, including light and heat.
- 10. A light gas formed when hydrogen atoms fuse together in stars.
- 12. The path an object takes as it moves around another object, like Earth around the Sun.
- 14. Another name for gas giants—big planets made mostly of gas.
- 15. A layer of the Sun where energy moves slowly outward as light particles (photons).
- 16. All types of energy waves, from radio waves to gamma rays. Visible light is just one part.
- 17. The time it takes for something to complete a cycle, like one orbit or one rotation.