It started out as a hobby, and eventually led to conversations with NASA.
An amateur photographer in northern England used a weather balloon to capture images of earth from the edges of space. Robert Harrison used low-cost materials and tracked the balloon's progress from his home office. Even he was surprised by the results.
'The first time I saw the pictures, I couldn't believe it!' he said.
The rare images caught the attention of experts in the field, and it wasn't long before Harrison was contacted by NASA.
'They saw the pictures on the internet,' explains Harrison.
He eventually launched 12 High Altitude Balloons, similar to those used by weather centres. Harrison then used standard GPS tracking devices to monitor the ballons and retrieve them when they returned to earth.
The balloons hovered 35 kilometres above the earth's surface.
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