Space is full of all sorts of garbage that can cause problems, including some of the stuff we send up there with good intentions. Take CubeSats. These nanosatellites, which weigh roughly 1kg, were first sent into space in December 2006, and have become increasingly popular in the years since as a cost-effective option for telecommunications companies looking to spread Wi-Fi and brand recognition. The thing is, there are so many of them now that experts are concerned about them bashing into each other -- or worse.