The Big Idea

By blending astronomy, biology, and history, Cosmos offers a perspective on our existence that shows humanity as deeply connected to the universe. As we search for extraterrestrial life and investigate the mysteries of space, we are also reminded of the rarity and vulnerability of our planet.

Sections

Ask Carl Sagan

Jump into the ideas before you finish the whole summary.

Cosmos

The Big Idea

Sections

The Early Human Search for Explanation

The Successive Demotions of Human Conceit

Biological Continuity and Cosmic Ingredients

The Fragility of the Planetary Environment

Information Storage and Civilizational Progress

The Search for Life Beyond Earth

Technology, Survival, and Human Choice

Ask Carl Sagan