Earth's Place in the Universe

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Across
  1. 2. A meteor that strikes Earth’s surface.
  2. 6. The amount of material in an object
  3. 7. A complete spin on an axis.
  4. 11. Any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter.
  5. 12. A scientist who studies the stars, planets, and other natural objects in space.
  6. 13. A chunk of rock from space that travels through Earth’s atmosphere
  7. 14. A collection of billions of stars, dust and gas that is held together by gravity.
  8. 15. An object in space that produces its own energy, including heat and light
  9. 18. One complete trip around an object in a circular or nearly circular path
Down
  1. 1. When a star or other object in the sky seems to move even though it is Earth that is moving.
  2. 3. The regular rise and fall of the water level along a shoreline
  3. 4. Any of the patterns of stars that can be seen in the night sky from here on Earth.
  4. 5. The distance light travels in a year.
  5. 6. The apparent shapes of the Moon in the sky.
  6. 8. Person trained to pilot a spacecraft, operate any of its systems, or conduct research during space-flights
  7. 9. The galaxy in which we live. Our solar system is located here.
  8. 10. Hemisphere - half of the Earth that lies north of the equator.
  9. 15. Hemisphere - half of the Earth that lies south of the equator.
  10. 16. The gasses that surround the Earth
  11. 17. The force of attraction between any two objects due to their mass.