Space Systems Vocabulary

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Across
  1. 6. The region of interplanetary space between the orbits of Mars and Jupiter in which most asteroids are found.
  2. 9. A gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
  3. 10. A scale factor is a number which scales, or multiplies, some quantity.
  4. 14. The leading theory in which the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density.
  5. 16. A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
  6. 18. An imaginary line about which a body rotates.
  7. 20. The natural satellite of a planet.
Down
  1. 1. The collection of planets and their moons in orbit around a star, together with smaller bodies in the form of asteroids, meteoroids, and comets.
  2. 2. The quantity of matter which a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field.
  3. 3. The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
  4. 4. A galaxy that does not have a distinct regular shape.
  5. 5. A self-luminous gaseous spheroidal celestial body of great mass which produces energy by means of nuclear fusion reactions.
  6. 7. A region of the solar system beyond the orbit of Neptune, believed to contain many comets, asteroids, and other small bodies made largely of ice.
  7. 8. A celestial body moving in an elliptical orbit around a star.
  8. 11. A type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image.
  9. 12. A unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
  10. 13. 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.
  11. 15. An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
  12. 17. The branch of science which deals with celestial objects, space,and the physical universe as a whole.
  13. 19. All of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.