History of Astronomy

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Across
  1. 3. a large celestial body that orbits a star, is massive enough to become nearly round due to its own gravity, and has cleared its orbital path of other objects
  2. 4. the Italian astronomer who discovered the gap between Saturn's rings
  3. 5. a massive system of stars, star systems, dust, and gas, held together by gravity
  4. 6. an instrument that collects electromagnetic radiation, like visible light, and other energy forms, such as radio waves or X-rays, from distant objects to make them appear larger, brighter, or otherwise more observable to the human eye or scientific instruments
  5. 7. ancient Greek astronomer, geographer, and mathematician credited with developing trigonometry
  6. 9. an expert in or student of astronomy
  7. 10. the invisible force of attraction between anything that has mass or energy, pulling objects with more mass more strongly
  8. 11. a massive, luminous sphere of plasma—mostly hydrogen and helium—held together by its own gravity, which generates energy through nuclear fusion in its core
  9. 17. father of the heliocentric theory
  10. 18. developer of the geocentric model of the solar system
  11. 19. researched gravity and developed the laws of motion
Down
  1. 1. the act of studying and measuring celestial objects and phenomena using instruments like telescopes
  2. 2. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure
  3. 8. a star (like our Sun) and all the celestial objects that orbit it, including planets, moons, asteroids, comets, and dwarf planets, all held together by the star's gravity
  4. 12. a broad, evidence-based explanation for a natural phenomenon that has been repeatedly tested and confirmed through observation and experimentation
  5. 13. a free African American farmer, self-educated mathematician, astronomer, and almanac author
  6. 14. known for many inventions and the improvements of his refractory telescope
  7. 15. when the Moon passes between the Sun and Earth, blocking the Sun's light
  8. 16. a German astronomer who discovered the laws of planetary motion