To mark the tenth anniversary of Sagan's death, David Morrison, a former student of Sagan, recalled "Sagan's immense contributions to planetary research, the public understanding of science, and the skeptical movement" in Skeptical Inquirer.
Para conmemorar o décimo aniversario da morte de Sagan, David Morrison, un dos seus antigos alumnos, lembrou as inmensas contribucións de Sagan á investigación planetaria, á comprensión pública da ciencia, e ó movemento escéptico na revista Skeptical Inquirer.