In 1986 Scientific American drew attention to this visual of space junk tracked by NORAD, 7,000 spent rocket debris and the 40,000 objects with a diameter of 10 centimeters or more. I used this visual in many of my presentations in the 1980s and in Paradigms in Progress (1991), making the point that not only was space junk a result of our wasteful, "rearview mirror" industrial paradigm, and that even debris the size of the paint flake which damaged the space shuttle Challenger’s windshield in 1984 could, at orbital speeds endanger future satellites and space travel.