Across
- 3. a massive planet mostly made of hydrogen; about 1,000 of these can fit into our sun
- 6. what two hydrogen atoms fuse into
- 8. the force that holds together our solar system
- 9. our star
- 10. what is released from nuclear fusion and what all living things need to survive
- 11. electromagnetic radiation
Down
- 1. this is a reaction that occurs over and over again; it happens with nuclear fusion in stars
- 2. this builds up in a star with more mass
- 4. the amount of matter in a given volume
- 5. the process that lights up a star
- 7. the simplest and most abundant element