Astronomy Sielaff 6th

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Across
  1. 3. are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas.
  2. 4. an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
  3. 6. he alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
  4. 9. movement, or a tendency to move, toward a center of attractive force, as in the falling of bodies to the earth
  5. 11. a loose collection of ice and dust that orbits the sun, typically in a long narrow orbit
  6. 12. the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account
  7. 15. an eclipse in which the sun is obscured by the moon.
  8. 16. the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution
  9. 18. Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
  10. 20. an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area for its orbit.
  11. 21. a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion
  12. 22. the action of rotating around an axis or center
  13. 23. a tide just after the first or third quarters of the moon when there is the least difference between high and low water.
  14. 25. the partially shaded outer region of the shadow cast by an opaque object
  15. 27. an imaginary line that passes through a planets center and its north and south poles, about witch the planet rotates
Down
  1. 1. a chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information
  2. 2. a pattern or grouping of stars that people image to represent a object or figure
  3. 5. an eclipse in which the moon appears darkened as it passes into the earth's shadow.
  4. 7. a large, bowl-shaped cavity in the ground or on the surface of a planet or the moon, typically one caused by an explosion or the impact of a meteorite or other celestial body.
  5. 8. an object that orbits the planet
  6. 10. either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.
  7. 13. an overthrow or repudiation and the thorough replacement of an established government or political system by the people governed
  8. 14. a tide just after a new or full moon, when there is the greatest difference between high and low water
  9. 17. small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
  10. 19. a streak of light in the sky produced by the burning of a meteoroid in earth's atmosphere
  11. 24. the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20)
  12. 25. a distinct period or stage in a process of change or forming part of something's development
  13. 26. the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse