Astronomy

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Across
  1. 3. The path an object takes around another, often used to describe the path of planets around the Sun.
  2. 4. The average distance from the Earth to the Sun, approximately 93 million miles (150 million kilometers).
  3. 8. A region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation—can escape from it.
  4. 9. A Danish astronomer known for his accurate and comprehensive astronomical observations.
  5. 10. The increase in the illuminated part of the Moon or a planet.
  6. 11. A celestial object consisting of a nucleus of ice and dust that develops a bright, fuzzy tail when near the Sun.
  7. 15. A space telescope launched into low Earth orbit, providing clear images of distant galaxies and nebulae.
  8. 20. A small rocky body that orbits the Sun, typically found in the asteroid belt between Mars and Jupiter.
  9. 21. A meteoroid that survives its journey through Earth's atmosphere and lands on the Earth's surface.
  10. 22. An explosive event that occurs during the death throes of a massive star.
  11. 23. A hypothetical region of space containing a large number of comets, located far beyond the orbit of Pluto.
  12. 25. The prevailing cosmological model that explains the origin of the universe.
  13. 31. Pertaining to the sky or the heavens.
  14. 32. The change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave.
  15. 33. The distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).
  16. 34. A small rock or particle in space.
  17. 36. A planet that orbits a star outside our solar system.
  18. 37. When the Earth passes between the Sun and the Moon, causing the Earth's shadow to fall on the Moon.
  19. 41. A meteoroid that enters the Earth's atmosphere and burns up due to friction with the air, also known as a shooting star.
  20. 42. Three laws that describe the motion of planets around the Sun.
  21. 44. A vast system of stars, gas, and dust bound together by gravity.
  22. 45. The Moon phase where the entire face is visible from Earth.
  23. 46. A celestial body that orbits the Sun, is spherical in shape, and has cleared its orbit of other debris.
  24. 47. More than half but less than fully illuminated Moon or planet.
Down
  1. 1. A system comprising the Sun and the celestial bodies that orbit it, including planets, moons, and asteroids.
  2. 2. Rocky planets, including Mercury, Venus, Earth, and Mars.
  3. 5. The force that attracts objects with mass towards each other.
  4. 6. Having the Sun at the center, as in the heliocentric model of the solar system.
  5. 7. A hypothetical form of matter that is believed to make up approximately 85% of the matter in the universe.
  6. 10. A small, dense remnant of a star that has exhausted the nuclear fuel in its core.
  7. 12. A large, cool star in the later stages of its life cycle.
  8. 13. The Moon phase where the side facing Earth is not visible.
  9. 14. The different appearances of the Moon or a planet as seen from Earth during its orbit.
  10. 16. An optical instrument that gathers and magnifies light to observe distant objects.
  11. 17. A cloud of gas and dust in space, often the birthplace of stars.
  12. 18. Less than half illuminated Moon or planet.
  13. 19. The decrease in the illuminated part of the Moon or a planet.
  14. 24. When the Moon passes between the Earth and the Sun, blocking all or part of the Sun's light.
  15. 26. The process by which two atomic nuclei combine to form a heavier nucleus, releasing energy.
  16. 27. A group of stars forming a recognizable pattern in the sky.
  17. 28. The obscuring of one celestial body by another, such as a solar or lunar eclipse.
  18. 29. Planets composed mostly of gas, including Jupiter and Saturn.
  19. 30. The scientific study of celestial objects such as stars, planets, and galaxies.
  20. 35. The apparent shift in the position of an object when viewed from different angles.
  21. 38. A luminous celestial object consisting of a mass of gas that generates light and heat through nuclear reactions.
  22. 39. Having the Earth at the center, as in the geocentric model of the solar system.
  23. 40. A Renaissance mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center.
  24. 43. An American astronomer who played a crucial role in the development of the Big Bang Theory and the concept of an expanding universe.