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The Star Trek TV and movie series imagine a bright future for humans in space and remain an inspiration for anyone interested in pondering our destiny on Earth and beyond.

Forty years ago, on the dusty plains known as the Sea of Tranquility, Neil Armstrong stepped off a lunar module and into the pages of history.

Do you want to believe? Seth Shostak of SETI talks about his hunt for aliens in this show about the search for life beyond Earth.