The Pale Blue Dot

Voyager 1 looked back from six billion km: Earth, one pixel. Carl Sagan gave the image its immortal caption.

The moment of The Pale Blue Dot: https://nowsky.org/e/pale-blue-dot — opens at the right place and time, replayable, no login.

Available views: Orbit ✓ · Sky — (not visible in the sky)

The story

On 14 February 1990, its planetary mission over, Voyager 1 turned its camera back toward Earth at Carl Sagan's long-standing request. From 6 billion km Earth was a dot of 0.12 pixels caught in a stripe of scattered sunlight — less than a single pixel of the whole frame.

The 60 frames taken that day captured six planets — Venus, Earth, Jupiter, Saturn, Uranus and Neptune — the first "family portrait" the solar system ever took of itself. Mercury was too close to the Sun and Mars was lost in the glare. Thirty-four minutes later the camera was switched off for good to save power.

Sagan gave the picture the most famous caption in history: "Look again at that dot. That's here. That's home. That's us." His reflection that every war, every love and every civilisation happened on that one pixel has outlived the photograph itself.

The picture almost did not happen. Pointing the camera toward the Sun was considered risky and was resisted for years; Sagan lobbied for nearly a decade and approval came only as the mission was ending. Move the orbit view to 14 February 1990 and it shows where Voyager 1 looked back from and how small Earth was.

Why it matters

As data the Pale Blue Dot is nearly worthless — Earth is one pixel and a band of scattered light crosses the frame. It became the most famous image of space exploration not because of what it shows but because of where it was taken from: humanity's place seen from 6 billion km, made visible for the first time.

Sagan's words made it a philosophical artefact. His argument that one pixel refutes "our posturings, our imagined self-importance, the delusion that we have some privileged position in the universe" became a 1994 book of the same name and a standard text on the ethics of exploration.

The image became the template for every "look back at Earth" since — Cassini's picture of Earth through Saturn's rings on "the day the Earth smiled" in 2013, and the 2020 reprocessing of the Voyager frame itself, were both made with this one in mind.

How to watch

Follow Voyager 1 in the orbit view and move the time to 14 February 1990 to reproduce its position at the moment of the photograph — 32° above the ecliptic, 40.5 AU from the Sun — and see which way Earth lay. Setting Earth as the gaze target gives the camera direction.

In the 3-D interstellar view, set the solar system at a 40 AU half-width and raise the camera above the ecliptic to reproduce the arrangement of the six planets in the portrait. Earth stays a point no matter how far the view zooms.

In 2020 NASA released a reprocessed version made from the original data with modern tools; the dot inside the scattered-light band is crisper and Earth's blue tint clearer than in the original.

See this for yourself — replay the moment in the orbit view

Background

At the time Voyager 1 was 40.5 AU from the Sun and 6 billion km from Earth. Each frame was a 0.72-second exposure, and the data trickled back until May 1990 because antenna time was shared with Magellan and Galileo.

Sagan first proposed the picture right after the Saturn flyby in 1981. It was deferred as having no scientific value, and there was concern that pointing at the Sun would damage the sensor. Only when the camera was to be shut down after the 1989 Neptune encounter was it approved as a last chance.

"Pale Blue Dot" was the title Sagan gave his 1994 book; the picture was originally just one frame of the "Solar System Family Portrait". The frame with Earth was shot through a blue filter, which is why Earth looks bluer than it really is.

FAQ

How far away was it taken from?

About 6 billion km from Earth, 40.5 AU from the Sun, on 14 February 1990.

How big is Earth in the picture?

0.12 pixels — less than one pixel, caught inside a band of scattered sunlight.

Why was the camera switched off?

To save power after the planetary mission ended; it was shut down for good 34 minutes after the picture and has not been used since.

Which planets are missing from the portrait?

Mercury was too close to the Sun, Mars was lost in the glare, and Pluto was too faint.

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Times and figures are approximate — verify with official sources when planning travel. Simulation uses J2000 mean elements.