Our Solar System

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Across
  1. 2. representation of an idea, phenomenon, or object in the universe
  2. 4. a meteor that hits Earth’s surface
  3. 5. an icy rock that lets off gas and dust, which may form tails when it is flying close to a sun in its elliptical orbit
  4. 7. the gases held by gravity around Earth and around other planets. It can also be used to talk about gases around stars.
  5. 11. an imaginary line running through an object around which it rotates.
  6. 12. a natural satellite object that revolves around a bigger planet, dwarf planet, or asteroid; astronomers usually call them satellites or natural satellites.
  7. 13. a donut-shaped region of millions of icy objects that exists outside the orbit of Neptune. Objects in the Kuiper belt consist of "ices" such as ammonia, water, and methane. it includes some larger objects like the dwarf planets Pluto and Eris
  8. 16. a force attracting one object towards another object
  9. 17. a fragment (piece) of an asteroid or comet with a size ranging from a few millimeters to several tens of meters.
  10. 19. the movement of an object around another object.
  11. 20. ratio between a model's dimensions and the actual object
  12. 21. the movement of an object around its own center axis.
  13. 22. a scientific instrument designed to gather and magnify light or other electromagnetic radiation from distant objects in space
  14. 24. one of the four gaseous planets in our solar system that do not have a solid surface and are beyond the asteroid belt
  15. 25. a spherical shell around our solar system. It may contain more than a trillion icy bodies. Long-period comets (which take more than 200 years to orbit the sun) come from the Oort Cloud. It is 2,000 to 200,000 AU away from the sun.
  16. 26. the space between Mars and Jupiter where most asteroids are found
Down
  1. 1. the amount of time it takes for a celestial body to complete one orbit
  2. 3. the amount of time it takes a celestial body to spin around its axis once
  3. 6. planet with a surface made up of a thick layer of hydrogen gas, rather than a solid surface you can stand on
  4. 8. a celestial body that: is in orbit around the Sun, has sufficient mass to assume a nearly round shape, and has "cleared the neighborhood" around its orbit.
  5. 9. one of the four terrestrial planets in our solar system that have hard, rocky surfaces you can stand on; are within 2AU of the sun; and are within the asteroid belt
  6. 10. a celestial body that orbits the sun, is round in shape, is not a moon, but has not cleared its orbit, and therefore can not be classified as a planet
  7. 14. Earth-like planets that have a hard, rocky surface that you could walk on
  8. 15. a rocky object that orbits the sun; some are the size of a pick-up truck. Others are hundreds of miles across
  9. 17. the streak of light caused when a meteoroid enters a planet’s atmosphere and starts to burn from the heat of friction.
  10. 18. the path that one celestial body follows around another
  11. 23. a human-made object that orbits around a celestial body, such as a planet or moon