Space System Vocabulary

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Across
  1. 4. A celestial body moving in an elliptical orbit around a star.
  2. 7. A large system of dust, gas, stars, and other celestial bodies that has a particular shape.
  3. 9. A method for reducing measurements by the same amount to achieve the proportions of the scale model.
  4. 10. An imaginary line that runs through the middle of an object around which that object rotates; a line at the side or bottom of a graph.
  5. 11. A spherical shell of cometary bodies believed to surround the sun far beyond the orbits of outermost planets and from which some are dislodged when interrupted and fall towards the sun.
  6. 12. The curved path of one object, such as a planet or moon, around a central object, such as a star or a planet ; To move in a circular or elliptical path around a central object.
  7. 17. The natural satellite of the Earth, visible, by reflected light from the sun.
  8. 18. The theory of the solar system (or universe) where Earth is assumed to be the center of it all.
  9. 19. the speed of light within a vacuum is the same no matter the speed at which an observer travels.
  10. 20. A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
Down
  1. 1. The most widely accepted and used civil calendar internationally.
  2. 2. A natural or artificial object that orbits around another object in space.
  3. 3. Where the Earth and other planets revolve around the Sun at the center of the Solar System.
  4. 5. The space between the orbits of Jupiter and Mars where most asteroids are found.
  5. 6. a celestial object consisting of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
  6. 8. The total amount of mass in an object.
  7. 10. The branch of science that studies the stars, planets, and other objects in space.
  8. 13. An optical instrument that makes distant objects appear larger and brighter using lenses or curved mirrors.
  9. 14. All existing matter and space considered as a whole; the cosmos.
  10. 15. The distance that light travels in one year.
  11. 16. A band of small celestial bodies beyond the orbit of Neptune from which many short-period comets are believed to originate.