Halley's Comet-Once in a Lifetime

Halley's Comet returned to earth in late 1985 and early 1986 as it does once every 76 years, literally "once in a lifetime." This videotape by producer-astronomer, David Aguilar, shows you how it has been experienced and observed in the past; and how it is likely to be experienced and observed the next time it returns to earth. Includes experiments for school-age children.