" which would consist of "plasma globs, made up of energized nuclei and electrons." These would be fired into space at the speed of light towards enemy missiles. (Winkler 1999, 205)
             While all of these programs sound high-tech and interesting, this is exactly the problem that was faced. The technology to create such programs had not been perfected or in some cases, such as Yonas' and Teller's proposals, had not even been developed. The main problem with all of these programs, however, is that not a single one would be 100 percent successful. Supporters argued that this was better than nothing, but many, in-cluding world-renowned scientist Carl Sagan, was bitterly opposed to this. He likened the SDI program to that of a human contraceptive device. He wrote:
             "A contraceptive shield that deters 90 percent of 200
             million sperm cells is generally considered worthless –
             20 million sperm cells penetrating the shield are more
             than enough. Such a shield is not better than nothing; it
             ...