Image for The Drake equation

The Drake equation

Duration: 02:20

The Drake equation is designed to estimate the number of detectable alien civilisations in the Milky Way, as Frank Drake explains in this clip.

Available since: Thu 12 Aug 2010

This clip is from

Horizon 2007-2008, Are we Alone in the Universe?

Science series. A planet has been discovered that could support life.

First broadcast: 04 Mar 2008

Image for Are we Alone in the Universe? Not currently available on BBC iPlayer

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