Scavenger Hunt Crossword Puzzle

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Across
  1. 4. I travel alone because I have no sun to call home
  2. 5. Some people call me Earth's faraway cousin
  3. 6. I can swallow light, but I don't have a mouth
Down
  1. 1. I am a spectacular explosion that marks the end of a massive star's life
  2. 2. I'm tiny, hot, and much denser than my bright partner
  3. 3. I spin so fast that I flash like a cosmic lighthouse