astronomers

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Across
  1. 5. - Occurs when one celestial body blocks the light from another.
  2. 7. - A region in space where gravity is so strong that nothing can escape.
  3. 9. - The sixth planet from the Sun, known for its rings.
  4. 11. - A highly energetic and distant active galactic nucleus.
  5. 14. - The force that attracts objects toward one another.
  6. 15. - A sudden eruption of energy from the Sun's surface.
  7. 17. First to use a telescope to study the stars.
  8. 20. - Pertaining to the Sun.
  9. 21. - The "Red Planet," fourth from the Sun.
  10. 22. - The curved path of a celestial body around another.
  11. 24. - Formerly considered the ninth planet, now classified as a dwarf planet.
  12. 26. Ancient astronomer who created the geocentric model.
  13. 28. - A cloud of gas and dust in space, often a star-forming region.
  14. 30. Popularized science and studied planetary atmospheres.
  15. 33. - Relating to Copernicus’ heliocentric theory.
  16. 39. - A planet outside our solar system.
  17. 40. - A vehicle used to propel objects into space.
  18. 41. - The branch of astronomy concerned with the physical properties of celestial bodies.
  19. 43. - An unknown form of matter that doesn't emit light but exerts gravitational effects.
  20. 44. - A small particle from space that enters Earth's atmosphere.
  21. 46. Known for his laws of planetary motion.
  22. 47. - The closest spiral galaxy to the Milky Way.
  23. 48. - A rotating neutron star emitting beams of radiation.
Down
  1. 1. - A Russian astronaut.
  2. 2. - The layer of gases surrounding a planet.
  3. 3. Developed the theory of gravity and laws of motion.
  4. 4. - The galaxy that contains our solar system.
  5. 6. - Relating to the periodic rise and fall of sea levels caused by the Moon’s gravity.
  6. 8. - The explosive death of a star.
  7. 10. - An instrument for observing distant objects in space.
  8. 12. - A group of stars bound together by gravity.
  9. 13. Proposed the heliocentric model of the solar system.
  10. 16. - The scientific study of celestial objects and phenomena.
  11. 18. - The distance that light travels in one year.
  12. 19. - A small rocky body orbiting the Sun, mostly in the asteroid belt.
  13. 23. - Earth's natural satellite.
  14. 25. Made precise astronomical observations for Kepler’s laws.
  15. 27. - A small icy body that orbits the Sun and has a tail.
  16. 29. Developed the theory of relativity.
  17. 30. - Luminous spheres of plasma that generate light and heat.
  18. 31. Discovered that the universe is expanding.
  19. 32. - All of space and time, including all matter and energy.
  20. 34. - The star at the center of our solar system.
  21. 35. - The change in the wavelength of light due to an object moving away from the observer.
  22. 36. - Earth's "sister planet," known for its thick atmosphere.
  23. 37. - The force that attracts objects toward the center of the Earth (or any body).
  24. 38. - Referring to Galileo’s discoveries, including the moons of Jupiter.
  25. 42. - A layer in Earth's atmosphere that protects from harmful ultraviolet radiation.
  26. 45. - The seventh planet from the Sun, tilted on its side.
  27. 49. - The distance that light travels in one year.