July 19, 2013: A Day To Celebrate the Pale Blue Dot

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Over fifty years of traveling invisible interplanetary highways around our solar system, and nearly a decade of orbiting Saturn, have bought us to a keen awareness of the celestial bodies in motion around the Sun, and the series of events responsible for their birth and development.  We could hardly claim to know the complexity of the planetary systems that lie beyond the asteroid belt, the chronology of the early solar system, or the wide range of extraterrestrial environments where biological processes might be at work, were it not for the many exploratory expeditions that we have mounted to these far-flung worlds.


Courtesy Cassini Imaging Team. Credit: NASA/JPL-Caltech/SSI

But perhaps, above all, the greatest, most profound legacy of the quest we have undertaken to understand our origins is perspective…that crystalline, uncorrupted view of our cosmic place that erodes all delusion and confronts us with a powerful recognition of ourselves…a recognition that never fails to move us.

It is surely for this reason that of all the millions of images taken of the worlds in our solar system since the beginning of the space age, those that reach deeper into the human heart than any other, are those of our own home, as it might be seen in the skies of other worlds:  small, alone in the blackness of never-ending space and awash in the blue of its blue, blue oceans.

Cassini's first offering to this collection, taken in September 2006 when the spacecraft was placed, for scientific purposes, at significant remove in the shadow of Saturn, has become one of our most beloved images. This is an image (2.4mb) that draws gasps from anyone seeing it for the first time.  Small wonder:  In it, we behold something human eyes had never before seen … a backlit view of the full resplendent glory of Saturn's rings during an eclipse of the Sun, the smoky blue ring created by the exhalations of the small moon, Enceladus, and … best of all … a sight of our planet, Earth, a billion miles in the distance.  This is an image without peer, an image that can make one weep with joy, love, concern, an abiding sense of fellowship, and unspeakable awe.

As I have contemplated the inevitable and approaching end of our history-making travels through the Saturn system, I have longed to repeat that remarkable image, make it even better, and turn it into something very special. I imagined making it an opportunity for all of us to appreciate how far we have come in the exploration of our cosmic neighborhood and to celebrate the uniqueness of our lush, life-sustaining world and the preciousness of the life on it.   I wanted to repeat that image, only this time, tell all the world about it in advance.  Proclaim it to everyone everywhere: 'On this day, at this time, you, the Earth and everybody on it will have their picture taken … from a billion miles away!'  This could be a day, I thought, when all the inhabitants of Earth, in unison, could issue a full-throated, cosmic shout-out and smile a big one for the cameras far, far away.

And so it will be.

On July 19, 2013, the Cassini cameras will be turned to image Saturn and its entire ring system during the planet's eclipse of the sun. In the lower right, among the outer diffuse rings that encircle Saturn, will be a small speck of blue light with all of us on it. A mosaic of  images covering the rings from one end to the other, some taken in those filters that are used to make a natural color scene — that looks like what human eyes would see — will be taken at this time.  Also to be recorded: an image of the highest resolution that we are capable of taking, in which we will find Earth and its moon.  One will be a colorless, star-like point of light.  The other, of course, will be a pale blue dot.

So, at the appointed time, straighten up, brush your hair, go outside, gather with friends and family, think a thought or two about the starkness of our whereabouts, the beauty of our home planet, the marvel of our existence, and the magnificence of our accomplishments.   And then,  look up and smile.

(For updates on the activities taking place on July 19, and programs and contests to be run in association with that day, follow @carolynporco on Twitter and/or visit http://www.ciclops.org/view_event/193/

 

Carolyn Porco is the leader of the imaging team on the Cassini mission at Saturn and a veteran imaging scientist on the 1980s Voyager mission.  She participated in the taking of the famous 1990 Pale Blue Dot image of Earth taken from beyond the orbit of Neptune by NASA’s Voyager 1 spacecraft. 

Written By: Carolyn Porco
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24 COMMENTS

    • In reply to #1 by stevenwood21:

      Pale Blue Dot. What a mesmerising monologue written and delivered by Carl Sagan. One of the most important pieces of prose ever written in my opinion.

      Hear Hear!! Carl Sagan the Legend

  1. In reply to #8 by Bumpy:

    Cassini will be 898 million miles away from earth when it takes the photograph at 22:27 – 22:42 GMT. Light takes 1 hr 20 mins to travel that far, so if you go outside at 21:07-21:22 GMT and look towards Saturn there’s a chance that a photon of light will leave you and end up in Cassini’s camera lens…

    Are you sure the time given on the projects web page is not supposed to be the time when the light leaves earth? I’d be happy if you were right, for then my friends and I can be in the picture (at 23:27 CET Saturn will just have set here in Germany).

  2. In reply to #11 by foundationist:

    In reply to #8 by Bumpy:

    Are you sure the time given on the projects web page is not supposed to be the time when the light leaves earth?

    Hi, I sent an email the the author of the article and got the follwing reply:

    “We have factored in the time that it takes for the photons leaving Earth to hit Cassini’s cameras, so you don’t have to subtract out 80 minutes from the time we posted. Just go outside at the time we posted. We will soon have a blog post on saturn.jpl.nasa.gov/waveatsaturn to show you how we did some of the math to account for light travel times, so check back there in the next few weeks!”

    So I was wrong earlier, sorry. Also, I dare say that their calculation was probably a tad more comprehensive than mine!

    • In reply to #12 by Bumpy:

      In reply to #11 by foundationist:

      In reply to #8 by Bumpy:

      Are you sure the time given on the projects web page is not supposed to be the time when the light leaves earth?

      Hi, I sent an email the the author of the article and got the follwing reply:

      “We have factored in the time that it takes fo…

      That’s a pity. I’d have liked to be in the picture. In my hometown Saturn will be just on the horizon when the picture will be taken, but due to the mountains we won’t be able to see it…

      Thanks for your effort though, I was going to send an email myself but thanks to your kindness I don’t have to.

  3. A deep sentimental argument that awakens within us and descubrientos changes that have happened and that will happen in future ..

    Today we are taking a universe beginning to discovery Carl Sagan. ‘imaginations awakens dormant within us ….

    Thank you Master. friend

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  5. The Universe is truly awe-inspiring. We live at a time in history when we are actually visiting other worlds with robotic probes. We have available to us photographs of moons orbiting the outer planets, showing details of their mysterious terrain. Over the last few years telescopes have been sent into orbit that offer astounding looks into the distant Cosmos. Our small blue Oasis is a Wonder that took billions of years to find its place in this cacophony of celestial expanse. Let us marvel.

  6. What our species has achieved in the last one hundred years in terms of space exploration and our new found understanding as to how the universe works is astonishing. How is it we gaze to the stars in awe while others pray face down into a dirty rug?

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