Earth's orbit is cluttered with dead satellites and other assorted space junk, making it increasingly dangerous for the ISS and new satellites. DARPA's solution? Catch 'em all in a big ol' net.
The Electrodynamic Debris Eliminator, or EDDE, would be a spacecraft with 200 nets attached to it, allowing it to gather up any errant satellites. It could then either send them into the South Pacific, angle them to burn up on reentry or even recycle the materials right there in space for use in constructing future space stations or satellites.