The method you're referring to is called optical interferometry [1] (well, interferometry in general but optical for visible light obviously). Great strides hav

The method you're referring to is called optical interferometry [1] (well, interferometry in general but optical for visible light obviously). Great strides have been made in this department in recent years and I believe it's been used for exoplanet detection [2]. [1]: http://en.wikipedia.org/wiki/Optical_interferometry http://en.wikipedia.org/wiki/Optical_interferometry [2]: http://en.wikipedia.org/wiki/Astronomical_optical_interferometry http://en.wikipedia.org/wiki/Astronomical_optical_interferom...