Space

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Across
  1. 4. The final frontier
  2. 5. A star whose brightness flares
  3. 6. The total or partial blocking of a celestial body
  4. 7. A glow in a planet's ionosphere
Down
  1. 1. A large grouping of stars
  2. 2. A small particle of rock or dust that burns away
  3. 3. A gigantic ball of ice and rock that orbit the Sun