Powerful telescope to map the galaxy

A telescope with a camera so powerful it can photograph a human hair from a thousand miles away, is to be launched by the European Space Agency.

It's on a five year mission to produce the most detailed 3D map of the Milky Way ever.

The camera on the Gaia telescope will measure the size, brightness and position of around a billion stars to give us a clearer idea about the evolution of the Milky Way.

Nel finds out more about it.

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