This past week, the Canadian Space Agency hosted the first ever “Orbital Debris Workshop”. The purpose of the conference was to talk about “space junk” and what to do about it. Apparently, there are more than 16 000 pieces of debris, such as defunct satellites and spent rockets, which are being tracked and monitored. Beyond that, there are another 6 000 pieces that scientists are aware of but have not catalogued. There are also believed to be more than 100 000 pieces of space junk smaller than 5 centimetres in diameter that are currently orbiting their way around the earth. All this junk is a big problem for those who operate satellites or send people into space. For example, in 1983 the Space Shuttle Challenger came back to earth with a huge crack in one of its windows after it was struck by a paint chip that was floating around. The “International Space Station” has had to change course and the astronauts have been on “evacuation alert” several times because of incoming hazard...