Chapter 23, Lesson 1- Out of This World (Nouns)

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Across
  1. 1. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  2. 2. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matte
  3. 8. the bowl-shaped depression around the orifice of a volcano ; a depression formed by an impact (as of a meteorite)
  4. 10. a small, thin piece of something cut or split off a larger piece
  5. 11. a part or aspect of something abstract, especially one that is essential or characteristic
  6. 13. the matter from which a thing is or can be made
  7. 14. facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject
  8. 16. a scientist who studies the stars, planets, and other natural objects in space
  9. 17. a continuous area or expanse which is free, available, or unoccupied
  10. 23. the process or result of joining two or more things together to form a single entity
  11. 25. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun
  12. 26. an area or stretch of land having a particular characteristic, purpose, or use, or subject to particular restrictions
  13. 27. all existing matter and space considered as a whole; the cosmos
Down
  1. 1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass
  2. 3. any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter
  3. 4. the center or most important part of something
  4. 5. a principle or standard by which something may be judged or decided
  5. 6. the action or process of moving or being moved
  6. 7. Way is the galaxy that includes our Solar System; a broad band of light that can be seen in the night sky and that is caused by the light of a very large number of faint stars
  7. 9. the strength and vitality required for sustained physical or mental activity
  8. 10. system the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets
  9. 12. a coherent, typically large body of matter with no definite shape
  10. 15. a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid)
  11. 18. the branch of science which deals with celestial objects, space, and the physical universe as a whole
  12. 19. a violent and destructive shattering or blowing apart of something, as is caused by a bomb
  13. 20. the outside part or uppermost layer of something (often used when describing its texture, form, or extent)
  14. 21. the 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
  15. 22. a conception of or belief about something
  16. 24. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun