Astronomy Introduction Crossword

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Across
  1. 2. An event in which the Moon passes between the Earth and the Sun, blocking the Sun's light, casting a shadow on Earth.
  2. 5. The path that a celestial object, such as a planet or moon, follows as it revolves around another celestial body.
  3. 8. A vast collection of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. The Milky Way is an example of a galaxy.
  4. 10. The scientific study of celestial objects, such as stars, planets, galaxies, and the universe as a whole.
  5. 11. The phenomenon where light from distant galaxies is shifted toward the red end of the spectrum, indicating that the universe is expanding.
  6. 14. A star (e.g., the Sun) and all the celestial objects, including planets, moons, asteroids, and comets, that orbit it.
  7. 16. The faint afterglow of the Big Bang, detectable as microwave radiation throughout the universe.
  8. 18. A region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.
  9. 21. A celestial object that orbits a planet, moon, or other larger body. The Moon is Earth's natural satellite.
  10. 22. Matter A mysterious, invisible substance that does not emit, absorb, or reflect light but exerts gravitational influence on visible matter in the universe.
  11. 24. The distance that light travels in one year, approximately 9.46 trillion kilometers (5.88 trillion miles). It is a unit of astronomical distance.
  12. 25. The average distance between the Earth and the Sun, approximately 149.6 million kilometers (93 million miles).
  13. 26. An infrared telescope that orbits the sun 1.5 million kilometers from Earth.
Down
  1. 1. The prevailing cosmological model that suggests the universe originated from a singular, extremely hot and dense point approximately 13.8 billion years ago.
  2. 3. A celestial body that orbits a star, such as the sun, and has enough mass for its self-gravity to give it a nearly spherical shape.
  3. 4. A cloud of gas and dust in space, often the birthplace of stars.
  4. 6. An optical instrument that gathers and magnifies light to observe distant celestial objects.
  5. 7. A luminous celestial object consisting mainly of hydrogen and helium, which produces energy through nuclear fusion in its core.
  6. 9. An event in which the Earth passes between the Sun and the Moon, causing the Earth's shadow to be cast on the Moon.
  7. 12. A space-based observatory that has provided stunning images and valuable data about the cosmos.
  8. 13. A small celestial body composed of ice, dust, and rock that orbits the Sun, developing a visible tail when it approaches the Sun.
  9. 15. A recognizable pattern of stars in the night sky, often named after mythological figures or objects.
  10. 17. A small, rocky object that orbits the Sun and is often found in the asteroid belt, located between the orbits of Mars and Jupiter.
  11. 19. A planet that orbits a star outside of our solar system.
  12. 20. The spiral galaxy that contains our solar system.
  13. 23. A massive explosion of a star that briefly outshines an entire galaxy, leading to the creation of elements and often leaving behind a dense core called a neutron star or black hole.