A small figure stands at the prow of a luminous sailing ship drifting through a starfield of galaxies and nebulae.

Original artwork, not a still

Carl Sagan

The cosmos is all that is or ever was or ever will be.

— Cosmos: A Personal Voyage • 1980

Behind the line

What it means

Our interpretation.

It sets the terms in one sentence: everything, past, present and future, is the subject, and science is allowed to ask about all of it. The cadence is scriptural without the doctrine, which is why it works as a creed for people who find wonder in physics rather than faith. Fans quote it as the unofficial first line of popular science.

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In context

Spoilers for Cosmos: A Personal VoyageShow the scene

These are the opening words of Cosmos, Carl Sagan's book, written alongside the thirteen-part PBS series that first aired on 28 September 1980. In the book the sentence opens page 4 and is followed by a tingling in the spine and a feeling that we are approaching the greatest of mysteries. In episode 1, 'The Shores of the Cosmic Ocean', Sagan likewise opens with a description of the cosmos before boarding his 'Ship of the Imagination', a craft shaped like a dandelion seed, and sailing out to the galaxies and back to Earth.

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