Across
- 2. one type of supernova is caused by a ... star
- 4. the biggest explosion that humans have ever seen
- 7. stars generate the chemical ... needed to make up everything in our universe
- 9. this massive amount of fuel produces tons of ... causing the center to get very hot and producing pressure
Down
- 1. a star is in ... between two opposite forces
- 2. scientists have used supernovas to measure ... in space
- 3. when the star runs out of fuel ... wins and the star collapses
- 5. scientists have also learned that stars are the ... factories
- 6. massive stars burn huge amounts of nuclear fuel at their ...
- 8. each blast is the extremely bright, super powerful explosion of a ...