Journeys in Space and Time

Journeys in Space and Time is the eighth episode of Cosmos A Personal Voyage. It first aired 16 November 1980 on PBS.

Summary
Carl Sagan explores the changes that constellations undergo over time, the redshift and blueshift measured in interstellar objects, time dilation in Albert Einstein's theory of relativity, the designs of both Leonardo da Vinci and spacecraft that could travel near light speed, time travel and its hypothetical effects on human history, the origins of the Solar System, the history of life, and the immensity of space.

Cosmos Update
The idea of faster-than-light travel by wormholes is discussed.