Figure 4: Comets. A) Comet Halley in Milky Way, February 1986; B) Comet Halley, February 1986; C) Comet West, March 1976; D) Comet Kohoutek, June 1973; E) Comet Ikeya-Seki, November 1965; F) Comet West, computer enhanced; G) Comet LINEAR, July 2000; H) Comet Hale-Bopp, March 1997.