The Universe

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Across
  1. 2. A planet is an astronomical object that orbits a star.
  2. 3. Regions of the interstellar medium made up of gases as well as chemical elements in the form of cosmic dust.
  3. 6. Cosmic snowballs of frozen gases, rock, and dust that orbit the Sun.
  4. 8. A rocky celestial body, smaller than a planet and larger than a meteoroid.
Down
  1. 1. A gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
  2. 4. The remnants of a large star that dies in a supernova explosion.
  3. 5. A newborn galaxy or that source of energy that occurs in the black hole at the center of these newborn galaxies
  4. 7. The most widely recognized astronomical objects