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Carolyn Porco 
I mentioned this on Twitter and wanted to mention it here ...
It's possible that the strange distribution of very dark and very light on Pluto is a result of the kind of thermal runaway effect that has made Saturn's moon Iapetus, shown here, look the way it does. Regions that began life as slightly darker, and/or receive more direct sunlight, will grow even more so over time with the vaporization, and hence removal, of ice ... a process we know is happening on Pluto.
This effect can work really well if the ice is not pure ice but has dark impurities in it, as older Pluto ice most certainly does, and there are differences in slopes that result in differential solar heating, and the body is a slow rotater. All conditions are likely present at Pluto.
If some vaporized material remains bound to Pluto, it will eventually condense on the coldest place on the body, making that region brighter. If this happens over billions of years, it could result in a large ice deposit. Those colder locations may be, at this moment, the 'heart', which is on the anti-Charon facing hemisphere and is not receiving what little heat there may be to receive from Charon, as well as the un-solar-illuminated hemisphere of Pluto, which we haven't seen yet, and regions that are not so directly facing the sun.
Science on the fly ... as it happens and maybe totally wrong! We shall see.
Links to Iapetus picture captions:
Hi Res mostly-black view: http://www.ciclops.org/view.php?id=3764
Hi Res mostly-white view: http://www.ciclops.org/view.php?id=3786
Full body view: http://www.ciclops.org/view.php?id=3787

https://www.facebook.com/carolynporco/posts/10153148522849387
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"  On July 14th, NASA's New Horizons mission will reach its long-awaited destination: Pluto. The spacecraft left Earth in 2006. Since then, it's traveled more than 3 billion miles. NPR's Arun Rath talks with planetary scientist Carolyn Porco about the mission.  "
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Mike Brown ‏@plutokiller 
- Here's a figure from that 1996 Hansen & Paige paper showing how Pluto's surface ices move around with time. 
- In the fig, the solid line shows the latitude of the sun w/time, the dark regions show where the ice has evaporated, white is ice.
- We're approaching the 2029 summer solstice after which most of the northern ices might have headed south. Process already starting now.
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Carolyn Porco ‏@carolynporco 
Squiggly, discontinuous white 'line' from mid-left to lower-right reminds me of lower boundary of Triton's polar cap. 
https://twitter.com/carolynporco/status/620313748276772864
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Couldn't they build a camera that could focus?
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Remarkable!
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Carolyn Porco

Everyone: Humanity's first, historic encounter in the Kuiper Belt — New Horizons' flyby of its most renowned member, Pluto — is less than a week away! With New Horizons encounters of two smaller KBOs hopefully to occur in the next several years, this event marks the beginning of the end of our initial reconnaissance of the solar system. As I said in this New York Times Video, Iet's use this opportunity to revel in the glory of our achievements in the exploration of the solar system and to remind ourselves that we are indeed capable of wondrous and beautiful things.

https://www.facebook.com/carolynporco/posts/10153139788384387
On July 14, 2015, the New Horizons spacecraft will zip past Pluto and its five known moons. Nobody really knows what it will find.
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I believe that my hypothesis formation of the solar system, Pluto will return to the ranks of the planets.
В.Б.Павлов "День рождения Луны"
https://yadi.sk/i/AkJV6f3BfHxh2
Официальный сайт
http://www.moon-birthday.ru

https://youtu.be/hUfn7V21CbY
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Have them in circles
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Mike Brown ‏@plutokiller 
- Yay. I got my Charon craters. Now where are my ice-flow plains? 
- A month ago I suggested Charon would look like Uranus's moon Ariel. Similarities pretty good so far. 
      - Truth is, I'm more excited to see Charon. I suspect it will look something like this. 

http://www.nasa.gov/feature/charon-s-chasms-and-craters

https://twitter.com/plutokiller/status/620386689857400832
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https://twitter.com/plutokiller/status/609498669478383617

Ariel (left)                                                                         Charon (right)
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"  New Horizons’ newest images reveal Pluto’s largest moon Charon to be a world of chasms and craters. The most pronounced chasm, which lies in the southern hemisphere, is longer and miles deeper than Earth’s Grand Canyon, according to William McKinnon, deputy lead scientist with New Horizon’s Geology and Geophysics investigation team.

“This is the first clear evidence of faulting and surface disruption on Charon,” says McKinnon, who is based at the Washington University in St. Louis. “New Horizons has transformed our view of this distant moon from a nearly featureless ball of ice to a world displaying all kinds of geologic activity.”  "

http://www.nasa.gov/feature/charon-s-chasms-and-craters
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Mike Brown ‏@plutokiller 
- Just back from vacation. What's all of this Pluto stuff everyone is talking about?
- The latest Pluto images remind me of early adaptive optics images of Titan: totally cool and thoroughly uninterpretable. Soon, though. Soon.
- I'd do another round of Pluto image speculation but soon we reach the intersection of speculation and information. I'll wait. Just a little.
- OK, friends, the Pluto and Charon images are good enough for a new round of speculation. Let's start here: 
- The dominant feature on Pluto is the dark (but not quite continuous) equatorial band. This was nicely explained in 1996 in a paper by Hansen and Paige who showed how nitrogen evaporates from the warm equatorial regions and reaccumulates at the poles, leaving dark substrate behind. Dark substrate is probably tholins. Tholins = organic muck (sorry @PlanetDr). 
- Q1: Why is the dark equatorial band not continuous? A: No clue. The "heart" looks like the brightest spot on the surface, and its equatorial
- The heart could just be random feedback. It's bright, so reflects sunlight, so cold, so gets icy, gets brighter, gets colder, etc.
- Still, weird that it is at equator. Maybe something interesting going on there. Keep your eye out.
- North of the dark equator are the patchy tropics. Summer has started here recently, so I suspect this is where ice is currently evaporating and going poleward. Come back in 20 years and it might look just like the equator. Again, nicely modeled in Hansen & Paige.
- Q2: What are the polygonal features? A: Not polygons. Seems unlikely any physical process could form large scale linear features of that sort. Your eye is good at playing tricks on you. I suspect that on the nicely imaged side you'll see no giant polygons.
- Conclusions: even at this range it is really really hard to learn details of what is going on here. Recommendation? Go closer.
- OK, what about Charon? Still too low detail. I want craters, damnit. And I want them now. But I will have to wait.
- On Charon the brightest spots are likely to be ammonia rich water ice flows. Dark spots not dark, just lack of water flows.
- Even now, that's about all I can say. Amazing how fast this is all going to come and go and how much we will wish we saw but didn't.

https://twitter.com/plutokiller/status/619513418135900162
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Carolyn Porco ‏@carolynporco 
And don't forget Triton's cantaloupe terrain.  Will we see similar structures on Pluto? 
https://twitter.com/carolynporco/status/620290972132347905
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Enjoy life now, this is not a rehearsal.
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"We are stardust.........."
csny
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On the blog: Do you know who “Madame Saturn” is? Find out Sunday. http://www.startalkradio.net/do-you-know-who-madame-saturn-is-find-out-sunday/
Meet Carolyn Porco, responsible for Voyager's “The Pale Blue Dot" photo, who led the Cassini Imaging Team and orchestrated “The Day the Earth Smiled” image.
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Carolynporco How did the ring of Saturn?
Web site: http://WWW.moon-birthday.ru  The book: https://yadi.sk/i/AkJV6f3BfHxh2  movie https://youtu.be/hUfn7V21CbY 
In Russian, sorry. Because really need 10 different translators.
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Dedicated to the important task of encouraging Carolyn Porco to participate on Google plus.
Introduction

(expropriated from Wikipedia)

Carolyn C. Porco (born March 6, 1953) is an American planetary scientist known for her work in the exploration of the outer solar system, beginning with her imaging work on the Voyager missions to Jupiter,SaturnUranus and Neptune in the 1980s. She leads the imaging science team on the Cassinimission[1][2][3] currently in orbit around Saturn. She is also an imaging scientist on the New Horizons[4] mission launched to Plutoon January 19, 2006. She is an expert on planetary rings and the Saturnian moon, Enceladus.

She has co-authored over 120 scientific papers on subjects ranging from the spectroscopy of Uranus and Neptune, the interstellar medium, thephotometry of planetary rings, satellite/ring interactions, computer simulations of planetary rings, the thermal balance of Triton’s polar caps, heat flow in the interior ofJupiter, and a suite of results on the atmosphere, satellites, and rings of Saturn from the Cassini imaging experiment.[5]

Porco was responsible for the epitaph and proposal to honor the late renowned planetary geologistEugene Shoemaker by sending hiscremains to the Moon aboard theLunar Prospector spacecraft in 1998.[6][7]

A frequent public speaker, Porco has given two popular lectures at TED[8][9] as well as the opening speech[10] for Pangea Day, a May 2008 global broadcast coordinated from six cities around the world, in which she described the cosmic context for human existence. Porco has also won a number of awards and honors for her contributions to science and the public sphere; for instance, in 2008 she was named by Wired magazine as one of '15 People the Next President Should Listen To.'[11] In 2009, New Statesman named her as one of 'The 50 People Who Matter Today.'[12] In 2010 she was awarded the Carl Sagan Medal, presented by the American Astronomical Society for Excellence in the Communication of Science to the Public. And in 2012, she was named one the 25 most influential people in space by TIME magazine.




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