a . “An application of the present results to the [Milky Way] Galaxy yields one supernova per 26 (± 10 estimated error) years in very good agreement with the evidence from historical supernovae.” G. A. Tammann, “On the Frequency of Supernovae as a Function of the Integral Properties of Intermediate and Late Type Spiral Galaxies,” Astronomy and Astrophysics, Vol. 8, October 1970, p. 458.
u A more recent technique that surveyed thousands of galaxies, including smaller galaxies, concluded that
... the time between [supernova] explosions is 100 years or more.” Michael S. Turner, “Yes, Things Really Are Going Faster,” Science, Vol. 299, 31 January 2003, p. 663.
b . Keith Davies, “Distribution of Supernova Remnants in the Galaxy,” Proceedings of the Third International Conference on Creationism (Pittsburgh, Pennsylvania: Creation Science Fellowship, Inc., 1994), pp. 175–184.
u “Where have all the remnants gone?” Astronomy Survey Committee of the National Research Council, Challenges to Astronomy and Astrophysics (Washington, D.C.: National Academy Press, 1983), p. 166.