For the record...
Carl Sagan was not cremated. He was buried intact in Lakeview Cemetary in Ithaca, NY in December of 1996.
I sincerely doubt anyone would authorize disturbing his gravesite.
Besides, he sent a great part of his important self, his mind, on the Pioneer and Voyager probes.
http://en.wikipedia.org/wiki/Carl_Sagan
