The Square Kilometre Array (SKA) has been an on going project ever since 1991. The whole idea for the SKA is to have 15 meter wide telescopes located in thousands of locations around the world forming a spiral design that will in return act like one giant telescope. SKA has a similar design as the Very Large Array (VLA) however it will cover one squared kilometer. SKA will have a radius of approximately 560 meters. If we look at 500 nm light we can get a resolution limit of 5*10^-10 rad which would be 0.0001". With such precision we can study all the way back to the early universe. Obviously this project will cost a fortune and will take until 2023 to operate but it is definitely something to look forward to.
https://www.skatelescope.org
3 points. This is a radio telescope. It will not observe at 500 nm (and we can't really do interferometry at such short wavelengths).
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