Eart in Space Unit Project

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Across
  1. 3. The innermost and darkest part of a shadow
  2. 4. Earth’s lone natural satellite
  3. 5. Crash
  4. 7. A disk-shaped region on the edge of the solar system that contains masses of ice and icy rock, believed to be the source of comets with orbital periods of less than 200 years.
  5. 9. A mass that has reached Earth
  6. 10. The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy
  7. 11. A place in space where gravity pulls so much that even light cannot get out.
  8. 13. The region in which only a portion of the light source is obscured by the occluding body. An observer in the penumbra experiences a partial eclipse
  9. 14. When the Moon comes between the sun and the Earth, so that a viewer is in the moon's shadow, blocking the view of the sun.
  10. 17. A star that is in the center of the Solar System
  11. 18. The Sun's outer atmosphere made of frozen mass of gas and dust
  12. 19. A theoretical substance that makes up much of the universe; matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies
  13. 20. Where we live
Down
  1. 1. A spherical celestial body revolving about the sun, similar to a planet but not large enough to gravitationally clear its orbital region of most or all other celestial bodies. Pluto
  2. 2. The region of space between the orbits of Mars and Jupiter in which most asteroids are located.
  3. 4. galaxy The galaxy containing the solar system; consists of millions of stars that can be seen as a band of light stretching across the night sky.
  4. 6. A region of the solar system far beyond the orbit of the dwarf planet Pluto in which billions of comets move in nearly circular orbits.
  5. 8. A galaxy that forms a spiral with a bar running through it.
  6. 12. The Orion Arm is a spiral escalation of a minor spiral arm in the Milky Way galaxy that is approximately 3,500 light-years across 10,000 light-years in length.
  7. 15. When the Earth comes between the sun and the moon. When the moon is in the Earth's shadow it is not visible, so the moon is blocked by the Earth.
  8. 16. A chunk of rock and metal, smaller than a planet and larger than a meteoroid, that orbits the sun