space

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Across
  1. 1. Velocity – Speed needed to leave a planet’s gravity (6,8)
  2. 4. – Splitting of atomic nuclei (7)
  3. 5. – Four-dimensional continuum of the universe (5,4)
  4. 7. – Wavelength longer than visible light (8)
  5. 9. Probe – Unmanned spacecraft exploring space (5,5)
  6. 10. Dwarf – Failed star between planet and star size (5,5)
  7. 13. – Einstein’s theory about space and time (10)
  8. 16. – Process powering stars by combining nuclei (6)
  9. 17. – A type of neutron star with an intense magnetic field (8)
  10. 20. – Natural light display near poles (6)
  11. 21. – First artificial satellite (7)
  12. 24. – Particle of light (6)
  13. 26. – Wavelength shorter than visible light (11)
  14. 28. – Between galaxies (13)
  15. 31. – Probe that studied Saturn and its rings (7)
  16. 34. – Hypothetical collection of universes (10)
  17. 36. – The smaller moon of Mars (6)
  18. 39. – NASA’s program that landed humans on the Moon (6)
  19. 40. – Study of life in the universe (12)
  20. 42. – Space telescope that discovered thousands of exoplanets (6)
  21. 45. Ray – High-energy electromagnetic radiation (5,3)
  22. 46. Shuttle – Reusable spacecraft used by NASA (5,7)
  23. 47. Mass Ejection – Huge burst of solar plasma (7,4,8)
  24. 48. Disk – Disk of material around a forming star or black hole (9,4)
  25. 49. Flare – Sudden burst of energy from the Sun (5,5)
Down
  1. 2. – Early stage of star formation (9)
  2. 3. – Hypothetical tunnel through space-time (8)
  3. 6. – Region dominated by a planet’s magnetic field (13)
  4. 8. Class – Classification of stars by temperature (8,5)
  5. 11. – Fundamental particle of matter (5)
  6. 12. – Ice volcano found on icy moons (11)
  7. 14. – International Space Station acronym (3)
  8. 15. – Large group of galaxies (12)
  9. 18. – Force that attracts objects toward each other (7)
  10. 19. – Nearly massless particle (8)
  11. 21. Wind – Stream of charged particles from the Sun (5,4)
  12. 22. – Space between stars (12)
  13. 23. – Technique to analyze light from stars (12)
  14. 25. – NASA probe that explored outer planets (7)
  15. 27. Dwarf – Remnant of a low-mass star (5,5)
  16. 29. Microwave Background – Radiation from the early universe (6,9,9)
  17. 30. Cluster – Group of galaxies bound by gravity (6,7)
  18. 32. – Early NASA probe exploring outer solar system (7)
  19. 33. – Icy moon of Jupiter with a subsurface ocean (6)
  20. 35. Limit – Distance where tidal forces break apart bodies (5,5)
  21. 37. Boson – Particle linked to mass (5,5)
  22. 38. Rays – High-energy particles from space (6,4)
  23. 41. – Saturn’s largest moon (5)
  24. 43. – One of Mars’ two moons (6)
  25. 44. Sequence – Stage where stars spend most of their life (4,8)