Astronomy I

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Across
  1. 3. the mysterious expansion force which does not interact with electromagnetic radiation but is causing the expansion rate of the universe to accelerate
  2. 7. ripples in the cosmic microwave background (hint: three words)
  3. 8. all of space and everything in it
  4. 10. the closest star to Earth besides the Sun, located 4.3 light-years from Earth
  5. 15. 10 raised to the twelfth power (written as a number followed by 12 zeros)
  6. 17. a form of matter that does not interact with electromagnetic radiation or light but can be inferred by its gravitational effect on its surroundings
  7. 18. the name of the supermassive black hole at the center of the Milky Way Galaxy
  8. 20. the scientist who first predicted the existence of dark matter in the 1930s, long before Vera Rubin first discovered it
  9. 21. the astronomical term for the mass of the Sun
  10. 23. the name for the sixth largest moon of Saturn, which may harbor simple life forms in its underground oceans
  11. 26. the fundamental force which pulls all objects in the universe towards each other
  12. 27. a planet that orbits a star besides the Sun (hint: this is short for "extrasolar planet")
  13. 28. a black hole with a mass between 100 and 100,000 solar masses
  14. 29. microwave radiation from the early history of the universe, dating to only 380,000 years after the formation of the universe; another name for cosmic background radiation
  15. 30. another name of the universe itself
  16. 31. a group of galaxies bound together by gravity
Down
  1. 1. a group of three stars that are gravitationally bound together
  2. 2. the energy that is stored within an object
  3. 4. a theoretical ending of the universe in which gravity pulls all of the matter in the universe towards each other until a very small point is all that remains
  4. 5. a prefix that means "light" (hint: it is the first half of the word "photograph")
  5. 6. a theory created by Albert Einstein in 1919 that is considered to be a part of the laws of physics of our universe
  6. 9. a form of radiation predicted to be emitted by a black hole when one of two particles in a relationship becomes part of a black hole and the other particle in the pair steals energy from the black hole to change from a virtual particle to become a real particle in the universe
  7. 11. the form of electromagnetic radiation with the shortest wavelength
  8. 12. a galaxy that has not completely finished forming
  9. 13. the name for a star (or group of stars) and everything that orbits around it
  10. 14. the process by which a planet loses its atmosphere due to radiation from a star
  11. 16. the name for the largest moon in our solar system (hint: this moon orbits the planet Jupiter)
  12. 19. the largest moon of the planet Neptune
  13. 22. the event in which the universe formed from a very small point around 13.8 billion years ago
  14. 24. the last name of the first person to propose that the planets orbit around the Sun
  15. 25. the study of celestial objects, space, stars, galaxies, and the universe itself