Let’s talk space

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Across
  1. 4. The first artificial satellite of earth
  2. 7. First human in space
  3. 10. Father of the Indian Space Program
  4. 13. The first mission that landed humans on the moon
  5. 14. Location of the largest optical telescope on earth
  6. 15. Missile man of India
Down
  1. 1. First Indian in Space
  2. 2. First dog in space
  3. 3. First American to fly into space
  4. 5. Spacecrafts designed to study Jupiter and Saturn by NASA
  5. 6. The country which successfully landed on Mars
  6. 8. India's first Mars mission
  7. 9. The second person to walk on the moon
  8. 11. India’s first satellite
  9. 12. Current chairman of ISRO