Across
- 1. what remains when a supergiant star collapses into itself
- 3. we can only make hypothesis about this, but we know it is in space
- 4. includes Jupiter, uranus,Saturn,Neptune
- 6. says that the milky way isn't our only galaxy there's not just one universe
- 7. a huge assemblage of stars
- 8. massive stars become this
- 9. hot center of the nebula
Down
- 1. what theory happened 13.7 billion years ago
- 2. Mercury,Venus, Mars, Earth
- 5. how the star begins (cloud of gas and dust)