2:46

Earth, Theia – and the creation of our Moon

Earth once had a twin, Theia. This is how they collided and made the Moon. Footage taken from the show One Strange Rock.

Flight at the Edge of the Ozone Layer

A Perlan glider uses air rising over the southern Andes to reach record heights and allow scientists to study the ozone layer. Images from the show "One Strange Rock".

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