The European Space Agency (ESA) is studying how to build a spoof-proof mega-constellation of satellites to deliver "4K video in your pocket" broadband. ESA's proposed HydRON project will create a network of satellites linked together in space that transmit laser signals between themselves and a few optical networks on the ground, in what they call a "world first" for fibre in the sky. This project, they say, will deliver Internet speeds of roughly one terabyte per second.