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Alien Worlds

Astronomers have found more than 4,000 planets circling stars other than our own. What do we know about these alien worlds and how have we managed to detect them?

English
  • Originally Aired September 8, 2019
  • Runtime 30 minutes
  • Content Rating United States of America TV-G
  • Production Code m0008c3h
  • Network BBC Four
  • Created October 14, 2019 by
    Administrator admin
  • Modified October 14, 2019 by
    Administrator admin