Image for Grand Tour sling shot demo

Grand Tour sling shot demo

Duration: 00:24

Presenter Dallas Campbell explains the rare alignment of the planets in 1977 which allowed a gravity sling shot mission to be accelerated from one planet to the next.

Available since: Wed 17 Oct 2012

This clip is from

Voyager: To the Final Frontier

A look at NASA's Voyager programme as the two spacecraft leave the solar system.

First broadcast: 24 Oct 2012

Image for Voyager: To the Final Frontier Not currently available on BBC iPlayer

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