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Across
1. What the most massive stars will eventually turn into
3. What our star will turn into in 5 billion years 4. our star 9. What nuclear reactions form from hydrogen 11. Early Earth had none of this gas in it's atmosphere 12. A end stage of big stars that shrink and spin very rapidly 13. Which is farther-planets or stars 14. Our galaxy that is 100,000 light years across 15. Made of billions of stars
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Down
2. May have killed the dinasaurs 65 million years ago
4. This is a large star that explodes near the end of it's "life". 5. German guy with bad hair who wrote E = MC squared 6. Means earth like 7. The sun, planets,meteors and comets 8. What stars are made mostly of 10. formed 4.6 billion years ago
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