A Voice for Our Earth: Carl Sagan and A Pale Blue Dot

converted PNM file
Image credit: NASA Jet Propulsion Laboratory (JPL). Photograph of Our Earth taken by Voyager 1 on Valentine’s Day, Feb. 14, 1990, during its last photographic assignment as it departed to the fringes of our solar system. Carl Sagan had suggested the probe take a last “family portrait” of the planets, ultimately convincing JPL leadership the assignment had humanitarian value despite its lack of any scientific use. At a distance of 4 million miles from the sun, Voyager 1 turned its camera around and took a series of 39 wide-angle and 21 narrow-angle color photos. In the narrow-angle photo above, Our Earth appears as a point of light only 0.12 pixel in size. By chance, Our Earth was the only one of the imaged planets to appear suspended within a scattered ray of light, a result of the photo being taken so close to the sun.

“Look again at that dot. That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there — on a mote of dust suspended in a sunbeam.

The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.

Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.

The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.

It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we’ve ever known.”

Carl Sagan, Pale Blue Dot, 1994

#rescuethatfrog

Family Portrait
Image credit: JPLVoyager 1‘s planetary family portrait. Mercury and Mars eluded the camera because they were lost in the glare of the nearby sun. Pluto, still considered a planet at the time, was too dim to see.

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