Cassini probe to Saturn takes this beautiful picture of our Earth & the Moon
Cassini probe to Saturn takes this beautiful picture of our Earth & the Moon
Cassini probe to Saturn takes this beautiful picture of our Earth
& the Moon

Did you smile and wave at Saturn on Friday? If you did (and even if you didn’t) here’s how you —

and everyone else on Earth — looked to the Cassini spacecraft, 898.4 million miles away.
Hope you didn’t blink!
The image above is a color-composite made

from raw images acquired by Cassini probe to Saturn in red, green, and blue visible light wavelengths. Some of the specks around the edges are background

stars, and others are the result of high-energy particle noise, of which some have been digitally removed.
The Moon is the bright dot just below and to the

left of Earth. (An original raw image (green filter) can be seen here.)
Cassini probe to Saturn acquired the images while capturing views of Saturn in eclipse against the Sun between 22:24:00 UTC on July 19

and 02:43:00 UTC on July 20 (6:24 to 10:43 pm EDT July 19.) On Cassini time, the Earth imaging took place between 22:47:13 UTC (6:47:13 pm EDT) and 23:01:56

UTC (7:01:56 pm EDT) on the 19th.

Full mosaic arrangement acquired by Cassini on July 19-20 UTC. Earth was positioned just below the planet. (NASA/JPL-Caltech/SSI)
Full mosaic arrangement acquired by Cassini on July 19-20 UTC. Earth was positioned just below the planet.

The world was invited to “Wave at Saturn” beginning 5:27 pm EDT on Friday — which allowed

enough time for the photons from a waving world to actually reach Cassini’s camera just beyond Saturn, 1.44 billion kilometres away. (Did you wave? I did!) It

was the first time Earth’s population was made aware beforehand that their picture would be taken from such a cosmic distance.
The image of our planet and

moon, seen as merely a couple of bright points of light against the blackness of space, recalls Sagan’s poignant “pale blue dot” passage from Cosmos…

“From this distant vantage point, the Earth might not seem of any particular interest. But for us, it’s different. Consider again 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 (1934–1996)

A full mosaic of Cassini’s imaging of Saturn

silhouetted against the Sun is expected in the coming weeks.
Image: NASA/JPL-Caltech/Space Science Institute. Composite by Jason Major.

Present Position

These computer-rendered images were generated by David Seal

using his Solar System Simulator. To obtain Cassini’s position in the sky or detailed orbital elements

for Cassini please visit the Solar System Dynamics web site and click on the Ephemerides – “Horizons” link. Follow the instructions provided.


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Donovan Crow
Donovan Crow
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