ESOcast 13: A sharper view of the Universe with the VLT Interferometer
In principle, the larger a telescope’s mirror, the finer the details it can see.
Continuing to increase the size of telescope mirrors is not an easy task, so astronomers have come up with a new technology to see even finer details: interferometry. This observational technique combines the light received by two or more telescopes and allows them to act as a single unit with a mirror diameter equivalent to the distance between the telescopes.
More info at: http://www.eso.org/public/videos/esocast13/
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