Artist's impression if giant telescope
Media playback is unsupported on your device
Video

Giant telescope to study star secrets

Construction of world's biggest optical telescope has been approved by member states of the European Southern Observatory (Eso).

The European Extremely Large Telescope (E-ELT) will have a primary mirror some 40m in diameter, and will be built on top of a mountain in Chile.

Pallab Ghosh reports.

Go to next video: Seen in 3D: The ants of the world