Our Universe Crossword

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Across
  1. 1. planets are only found around these.
  2. 2. this type of galaxy has a distorted appearance, with no distinct center or arms.
  3. 6. this type of galaxy has a smooth featureless appearance.
  4. 7. dark matter cannot absorb, reflect, or emit this.
Down
  1. 1. the Milky Way is this type of galaxy.
  2. 3. The type of waves scientist are using to try to communicate with life on other planets.
  3. 4. the most common explanation for the universe’s origin.
  4. 5. this type of matter makes up most of the universe.