Space pioneers

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Across
  1. 3. First artificial satellite to orbit space
  2. 5. First person to enter the space
  3. 6. First living thing in space
  4. 7. First rocket in space
Down
  1. 1. First spacecraft to cross interstellar space
  2. 2. First animal in space
  3. 3. First space telescope
  4. 4. First person in space