The Universe

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Across
  1. 2. celestial objects made out of frozen gases, rock and dust that orbit the Sun.
  2. 6. system consisting of a solitary star not gravitationally bound to other stars. (2 words)
  3. 10. large natural objects that orbit, or travel around stars.
  4. 12. when the iron in large stars causes it to explode, it becomes this.
  5. 13. about 10% of stars are made of this.
  6. 14. high-powered ____ like the Hubble is another tool for seeing far into space.
  7. 15. ____ 1 is the first human-made spacecraft designed to leave our solar system.
  8. 17. when the largest stars explode, they collapse under the pressure of tremendous gravity and become this. (2 words)
  9. 18. a star with planets orbiting around it (2 words)
  10. 21. type of black hole that has been detected at the center of many galaxies.
  11. 28. the middle-aged, middle-size star in our solar system.
  12. 29. another type of galaxy other than spiral, irregular, and peculiar.
  13. 31. the phenomenon by means of which bodies having mass are attracted to one another.
  14. 33. Greek word gala means.
  15. 34. ____ fusion is the process by which gas clouds get so hot it begins to form a star.
  16. 35. a Doppler shift toward longer wavelenths of an object moving outward at increasing rates of speed, suggesting that the universe is expanding. (2 words)
  17. 36. another name for asteroids.
  18. 38. in larger stars nuclear fusion eventually causes this to form in the star.
  19. 40. when the fuel of a smaller star begins to be used up, it is called this. (2 words)
  20. 41. a huge burning sphere of gas,
  21. 42. when all of the fuel of a small star is used and does not shine any longer it is called this. (2 words)
  22. 44. _____ sensing is the science of gathering data on an object or area from a considerable distance.
Down
  1. 1. tool that allows the different wavelengths and colors of light to be seen with the human eye.
  2. 3. the distance light travels in a year at the rate of 186,000 miles per second. (2 words)
  3. 4. About 90% of stars are made of this.
  4. 5. type of galaxy that we are in.
  5. 7. all of space and time and their contents
  6. 8. massive objects larger than our solar system that give off huge amounts of energy and reside in galaxies that have black holes.
  7. 9. two stars that appear as one to the naked eye (2 words)
  8. 11. after a star becomes a supernova, it either becomes a ___ star or a black hole.
  9. 16. small rocky bodies that orbit or travel around the sun.
  10. 19. type of black hole formed when massive stars use up all their fuel and die.
  11. 20. clouds of dust and gas. Plural form.
  12. 22. mathematical measurements can be used to determine if a planet is ____ around a distant star.
  13. 23. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
  14. 24. the center of a black hole where matter is crushed to infinite density because the pull of gravity is infinitely strong.
  15. 25. the fourth state of matter
  16. 26. _____ effect is an apparent shift in the frequency of a wave of electromagnetic radiation due to relative motion between the source of radiation and the observer.
  17. 27. two pulsating stars that are more than 65 billion light years from Earth.
  18. 29. the donut-shaped zone of no return on a black hole (2 words).
  19. 30. type of star that alternately increases and decreases in size usually with corresponding changes in brightness.
  20. 32. the name of our galaxy (2 words)
  21. 33. natural objects that orbit planets
  22. 37. type of matter that cannot be seen but has a gravitational effect on objects nearby.
  23. 39. the beginning of a star.
  24. 43. another name for universe.