A coalition of 15 European countries has announced plans to build the biggest telescope in the world.

The mirror inside the telescope will measure 39metres across - four times wider than today's biggest telescope - and it will be so powerful that astronomers will even be able to observe dark, rocky planets far beyond our solar system.

The European Southern Observatory project is supported by 15 members of the European Union and has the catchy name 'European Extremely Large Telescope'... even if it will be built in Chile, to avoid light pollution.

The twin infrared/optical telescope will sit on top of a 3,060metre mountaintop, giving unparralled views of the sky above, and should hopefully come online in 2022.

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