Astronomy So Far

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