Will SpaceX's satellites clog up the sky?

Listener Pete asks, "SpaceX has launched the first 60 of what is to be a mesh of some 12,000 satellites. Two questions: how will this completed mesh impact 1) ground based optical and microwave astronomical observations, and 2) the ability of future space missions, manned and otherwise, to navigate through the cloud of objects?" To answer this question, Phil Sansom got in touch with two experts: UCL's Ingo Waldmann, and ESA's Holger Krag... Like this podcast? Please help us by supporting the Naked Scientists