SPACE HUNT

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Across
  1. 2. What was the first artificial satellite?
  2. 3. The only naked-eye comet that can appear twice in a human lifetime?
  3. 6. Which planet is named after the sky god who was father of the titan?
  4. 7. Which planet is the densest?
  5. 8. I'm the ninth-largest object (including the Sun) of the Solar System without a substantial atmosphere. Who am I?
Down
  1. 1. The first animal to orbit the Earth died when the oxygen ran out on which day?
  2. 2. Brightest star in the space?
  3. 4. Gagarin First man in space?
  4. 5. First animal to orbit the earth?
  5. 7. Buzz Aldrin Second man to set foot on the moon?