Astronomy

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Across
  1. 2. The hottest of stars are this color.
  2. 6. A portion of the Earth passes through the shadow cast by the Moon, temporarily blocking sunlight, fully or partially, from reaching that portion of the Earth's surface. (two words combined into one)
  3. 8. A type of galaxy with an approximately ellipsoidal shape (elongaged circle) . (two words combined into one)
  4. 11. Our home galaxy. (two words combined into one)
  5. 12. The changing illumination of the Moon (or other body) over time growing more illuminated, between its new and full phases.
  6. 13. The coolest of the stars are this color.
  7. 14. A temporary dark blemish on the surface of the Sun that is a planet-size region of gas cooler than its surroundings.
  8. 23. The average distance from Earth to the Sun, slightly less than 93 million miles (150 million kilometers). (two words combined into one)
  9. 24. A measure of a star's absolute brightness. (two words combined into one)
  10. 25. The distance that light (moving at about 186,000 miles per second) travels in one year, or about 6 trillion miles. (two words combined into one)
  11. 26. The force of attraction between all objects depending upon their mass and distance.
  12. 27. The brightness of a star as it appears from the earth. (two words combined into one)
  13. 28. A unit of length used to express astronomical distances that is equivalent to the distance that an object moving at the speed of light in one year. (two words combined into one)
  14. 29. Occurs when the sun and moon align with the earth creating a greater tidal range. (two words combined into one)
Down
  1. 1. Occurs when the sun and moon are at right angles creating a lower tidal range. (two words combined into one)
  2. 3. Earth centered system.
  3. 4. A relatively small, icy body that displays extended features when it approaches the Sun.
  4. 5. An area of the sun where it's energy is trasferred by the process of radiation. (two words combined into one)
  5. 7. A massive ball of gas that generates prodigious amounts of energy (including light) from nuclear fusion in its hot, dense core.
  6. 9. The four planets closest to the sun, before the asteroid belt. (two words combined into one)
  7. 10. A gaseous envelope held in place by the gravity of a planet.
  8. 15. A huge cloud of gas and dust, solar systems are formed from these.
  9. 16. A large, gravitationally bound system that may contain hundreds of billions of stars and are categorized according to their visual morphology as elliptical, spiral, or irregular.
  10. 17. The solid, rocky body that orbits the Earth as its only natural satellite,
  11. 18. The changing illumination of the Moon (or other body) over time becoming less illuminated, between its full and new phases.
  12. 19. A vast collection of stars, gas, and dust, typically 10,000 to 100,000 light-years in diameter and containing billions of stars
  13. 20. The center of the sun where fusion take place generating the suns energy.
  14. 21. An area of the sun where it's heat energy is transferred by the process of convection. (two words combined into one)
  15. 22. Sun centered system