How to build and use a low-cost telescope

There have been incredible leaps in telescope technology over the past 100 years, letting us see deeper into space and further back into time. The technology has not been accessible to everyone - meaning large parts of the night sky have been left unexplored. Dr Tim Molteno from the University of Otago has just returned from Africa where he taught people how to build and use low-cost radio telescopes. Tim joins us Nights.