Issac's Question/Will the Sun Die/Siberian Tiger

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Across
  1. 2. force or heat
  2. 3. people or animals that try to catch animals
  3. 8. in 1970, there was only about this many siberian tigers in the world
  4. 9. in many more millions of years, the sun will cool to this type of dwarf star
  5. 12. the force that pulls objects toward one another
  6. 14. does not change
  7. 15. leaps at or walks toward
  8. 16. something that is smaller than the rest
  9. 17. not able to be seen
  10. 20. to grow in size; enlarge
  11. 22. the sun will shrink to a this type of dwarf star
Down
  1. 1. Issac's last name
  2. 3. the source of the sun's energy
  3. 4. the sun will expand in size and become this type of dwarf star
  4. 5. to lose heat
  5. 6. siberian tigers eat this much meat per day
  6. 7. to measure heaviness
  7. 10. Issac noticed this falling from a tree
  8. 11. staying up without support
  9. 13. the type of dwarf star the sun is now
  10. 18. no longer existing
  11. 19. sneaks; walks around trying not to be seen or heard
  12. 21. animals hunted by other animals