Alma radio telescope: How to move a giant antenna

The world's most powerful radio telescope has begun scientific operation.

The Alma (Atacama Large Millimetre/Submillimetre Array) telescope array, high up in Chile's Atacama desert, has commenced its quest to view the formation of the first stars in the Universe.

Building it has also been a remarkable feat of engineering.

Science correspondent Pallab Ghosh has been speaking to one of the leading engineers involved in the project, Pascal Martinez, about the technical challenges involved.