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by dr_orpheus 801 days ago
The even more extreme version of this JPL has been working on with their Starshade program. Not specifically a cornograph, but same concept of blocking light from a star to look for something more dim, in this case its looking for exoplanets. But it is a much larger scale. A 25 m deployable shade in formation 100 km away with the same level of mm precision.

https://www.jpl.nasa.gov/news/starshade-would-take-formation...

Edit: Just to be clear on status of this, Starshade is still in early technology demonstration phase that they can actually build the shade and do the formation maintenance. This is not in full build or slated to launch any time soon.