THE UNIVERSE AND GALAXIES

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Across
  1. 1. the star at the center of the Solar System.
  2. 3. a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
  3. 6. an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
  4. 10. Oval or egg shaped galaxy with older stars and little gas and dust.
Down
  1. 2. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
  2. 4. a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
  3. 5. Small galaxy containing a few million to a few billion stars.
  4. 6. Regions of gas and dust plus young stars that wind outward from the central area bulge.
  5. 7. Galaxy that is neither spiral nor elliptical.
  6. 8. Very large group of stars held together by gravity; a few million to a few billion stars.
  7. 9. Rotating type of galaxy with a central bulge and spiralarms with stars, gas, and dust.