In ancient days, comets were considered to be harbingers of ill-fortune. Today, comets provide possible answers about the origins of our Solar System. In this program, you'll learn about the composition of comets, their structure, and their behavior patterns in the Solar System. We'll also discuss the orbits of comets, their origins and evolution, and one of the most famous comets of all: Halley's Comet.

Originally released by Cerebellum Corporation, 2013. Streaming video file encoded with permission for digital streaming by Infobase on July 10, 2018.

Comets (3:59); --Origin and Evolution of Comets (1:32); -- Halley's Comet (4:40); -- Summary (1:49); -- Credits: What Are Comets? (0:39);.