Up and Up

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Across
  1. 1. Across our galaxy, what increases toward the galactic center and decreases as one moves outward?
  2. 3. It is defined as the distance light travels in one year.
  3. 8. Refers to a group of galaxies typically consisting of three to ten clusters and extending up to 2,000,000,000 light years.
  4. 9. What do you call the third largest and the only unbarred spiral galaxy in the Local Group?
  5. 11. What galaxy was created from a large rotating cloud which eventually collapsed?
  6. 13. What do you call the substellar objects with true masses, above the limiting mass for thermonuclear fusion of the deuterium?
  7. 14. What do you call the stars that composed of hydrogen and helium?
  8. 15. What do you call a vast cluster of galaxies?
  9. 18. What can impact earth in a very catastrophic manner like what had happened during the Cretaceous period?
  10. 19. What do you call the stage where the universe continues to expand and its temperature continues to decrease until such time that the universe runs out of any usable heat?
  11. 20. What is the first exoplanet directly observed from earth as it transited in front of its host star Pegasus?
Down
  1. 2. What scale uses a color code scale that describes the seriousness of the possible collision?
  2. 4. What do you call the asteroid that was expected to arrive in February 1, 2019?
  3. 5. What proves that there are exoplanets existing outside of our solar system and these planetary bodies possess certain characteristics which in a way reflect the same properties of those inside our solar system?
  4. 6. As a result of collisions, the flakes stuck together and allowed larger particles to attract more larger particles. What caused these rocks to come together and eventually form the planets?
  5. 7. It refers to the group of stars within the galaxy that resemble each other in terms of age, spatial distribution, or chemical composition.
  6. 10. What do you call the clusters found in the halo?
  7. 12. What has converted about 1% of the universe’s hydrogen into other elements?
  8. 16. What was discovered by Colin Stanley Gum in 1950?
  9. 17. What do you call the asteroids that orbit in the outer solar system?