Puzzle 1 Space

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Across
  1. 2. - Large, relatively cool star.
  2. 4. - Hypothetical tunnel in spacetime.
  3. 6. - Band of the celestial sphere.
  4. 8. - Study of the physical properties of celestial bodies.
  5. 10. - Planet outside our solar system.
  6. 14. - Celestial object with a tail.
  7. 16. - NASA program for moon exploration.
  8. 17. - Small celestial body entering Earth's atmosphere.
  9. 19. - Astronaut's activity outside a spacecraft.
  10. 21. - The universe as a whole.
  11. 23. - Natural light display in the polar regions.
  12. 26. - Rocky object orbiting the sun.
  13. 27. - Group of stars forming a recognizable pattern.
  14. 30. - Transmission of data from a spacecraft.
  15. 32. - Path of a celestial body.
  16. 35. - Rotating neutron star emitting pulses of radiation.
  17. 38. - Pertaining to the sun.
  18. 39. - Celestial event blocking light.
  19. 40. - Object orbiting a celestial body.
  20. 41. - Force that attracts objects to one another.
  21. 42. - High-energy radiation from space.
  22. 44. - Vehicle designed for travel or operation in outer space.
  23. 47. - Relating to the moon.
  24. 48. - Condition of very weak gravity.
  25. 49. - Unmanned spacecraft exploring space.
  26. 50. - Region between the orbits of Mars and Jupiter.
Down
  1. 1. - Optical instrument for observing distant objects.
  2. 3. - Study of celestial bodies' influence on human affairs.
  3. 5. - Neutron star with a strong magnetic field.
  4. 7. - Relating to the universe.
  5. 9. - Russian astronaut.
  6. 11. - Relating to planets.
  7. 12. - Vehicle for exploring the moon's surface.
  8. 13. - Group of stars held together by gravity.
  9. 15. - Region with intense gravitational pull.
  10. 18. - Instrument for viewing distant objects.
  11. 20. - Extraterrestrial being.
  12. 22. - Longest or shortest day of the year.
  13. 24. - Distance light travels in one year.
  14. 25. - Interstellar cloud of gas and dust.
  15. 28. - Subatomic particle with little mass and no charge.
  16. 29. - Between stars.
  17. 31. - Sun and the celestial bodies that orbit it.
  18. 33. - Debris in orbit around Earth.
  19. 34. - Fragment of a meteoroid that reaches the Earth.
  20. 36. - Pertaining to the heavens.
  21. 37. - Boundary around a black hole.
  22. 43. - Vast system of stars.
  23. 45. - Space traveler.
  24. 46. - Vehicle for space travel.