Astronomy So Far

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Across
  1. 1. A little over three light years.
  2. 6. First American in space
  3. 7. First person of color in space.
  4. 8. First to see moons around Jupiter.
  5. 9. The largest rocky planet in our system.
  6. 11. A large planet about the same size as Neptune.
  7. 12. The approximate time it takes to revolve around the Sun
  8. 18. First giant space telescope
  9. 19. First woman in space
  10. 24. First person in space
  11. 25. Everything
  12. 26. For every action there is an equal and opposite reaction.
  13. 28. First human object in space.
  14. 31. Said heavenly motion must be perfect because it's the realm of the gods.
  15. 32. Said planets orbit in ellipses.
  16. 33. The largest planet in our system.
  17. 34. Discovered Uranus
  18. 37. A star and its planets
  19. 40. The second largest planet in our system.
  20. 42. Father of modern rocketry.
  21. 44. About 8 light minutes.
  22. 46. The largest sphere in our system.
  23. 47. A spherical object that orbits a star without any other object in the same orbit.
  24. 48. The designing and building of a rocket.
  25. 49. A large planet about the same size as Uranus.
Down
  1. 2. Discovered black holes.
  2. 3. The second smallest rocky planet in our system.
  3. 4. The second largest rocky planet in our system.
  4. 5. Predicted expansion by the Big Bang
  5. 10. The smallest planet in our system.
  6. 13. The planetoid that marks the "end" of the solar system.
  7. 14. The time it takes the Solar System to orbit the galaxy.
  8. 15. Largest space telescope
  9. 16. Figured out the Earth is a sphere using triangles.
  10. 17. 300,000,000 m/s
  11. 20. Discovered Ceres
  12. 21. The distance light can travel in a year.
  13. 22. The distance from the Sun to the Earth
  14. 23. First to see other galaxies.
  15. 24. A lot of star systems orbiting a black hole
  16. 27. Explained that gravity acts on planets causing orbits.
  17. 29. Series of manned flights to the Moon.
  18. 30. First dog in space
  19. 35. Determined how to classify stars.
  20. 36. One rotation of a planet plus just a little bit to make up for revolution.
  21. 37. A bunch of groups of galaxies
  22. 38. A time period loosely based on Moon orbits
  23. 39. A bunch of galaxies
  24. 41. Probe that studied Pluto
  25. 43. Probe that studied Jupiter
  26. 45. Discovered Neptune