World's most powerful telescope up and running

A radio telescope high in the Chilean desert is the world's most powerful eye on the universe.

It looks like something out of a science fiction movie - giant antennas zooming in and out of a desert, their scopes trained on far-away galaxies.
But the project, based high in Chile's Altacama desert, is very much a reality.
At a cost of more than a billion dollars and nearly two decades in the making, the antennas form part of the world's most powerful telescope - called ALMA - which started operating on Tuesday.