What We Still Don't Know - 1 of 3
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ARE WE ALONE?
Sir Martin explores the possibility that life exists on planets beyond our own. He unveils an unsettling scientific debate that has startling consequences for us Earthlings. Do you believe in aliens? If not, a quick glance through these pages might change your mind!
Astronomer Sir Martin Rees Investigates
A Channel 4 (UK) Documentary