This past December, the New Horizons probe took a series of pictures from the Kuiper Belt, thus breaking the record for the most distant images ever taken!
While the New Horizons spacecraft was heading to Pluto, scientists from the mission used Hubble and other telescopes to try and find out more about the environment their spacecraft would be flying through. No one wanted New Horizons to run into unexpected dust or debris. And now, as New Horizons prepares to fly past its […]
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Many of the rocket and space flight enthusiasts I know are also car buffs. If you fit into that category, here’s an opportunity you won’t want to miss: a chance to own the car that New Horizons principal investigator Alan Stern drove all the way to Pluto. Well, technically, he drove his shiny red Nissan […]
Finally, the New Horizons team has their entire “pot of gold.” 15 months after the mission’s flyby of the Pluto system, the final bits of science data from the historic July 2015 event has been safely transmitted to Earth. “The New Horizons mission has required patience for many years, but we knew the results would […]
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By the end of this week, all the data gathered by the New Horizons spacecraft during its July 2015 flyby of the Pluto system will have finished downloading to Earth and be in the hands of the science team. Bonnie Buratti, a science team co-investigator said they have gone from being able to look at […]
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What lies beneath Pluto’s icy heart? New research indicates there could be a salty “Dead Sea”-like ocean more than 100 kilometers thick.
“Thermal models of Pluto’s interior and tectonic evidence found on the surface suggest that an ocean may exist, but it’s not easy to infer its size or anything else about it,” said Brandon Johnson from Brown University. “We’ve been able to put some constraints on its thickness and get some clues about composition.”
Research by Johnson and his team focused Pluto’s “heart” – a region informally called Sputnik Planum, which was photographed by the New Horizons spacecraft during its flyby of Pluto in July of 2015.
New Horizons’ Principal Investigator Alan Stern called Sputnik Planum “one of the most amazing geological discoveries in 50-plus years of planetary exploration,” and previous research showed the region appears to be constantly renewed by current-day ice convection.
The heart is a 900 km wide basin — bigger than Texas and Oklahoma combined — and at least the western half of it appears to have been formed by an impact, likely by an object 200 kilometers across or larger.
Johnson and colleagues Timothy Bowling of the University of Chicago and Alexander Trowbridge and Andrew Freed from Purdue University modeled the impact dynamics that created a massive crater on Pluto’s surface and also looked at the dynamics between Pluto and its moon Charon.
The two are tidally locked with each other, meaning they always show each other the same face as they rotate. Sputnik Planum sits directly on the tidal axis linking the two worlds. That position suggests that the basin has what’s called a positive mass anomaly — it has more mass than average for Pluto’s icy crust. As Charon’s gravity pulls on Pluto, it would pull proportionally more on areas of higher mass, which would tilt the planet until Sputnik Planum became aligned with the tidal axis.
So instead of being a hole in the ground, the crater actually has been filled back in. Part of it has been filled in by the convecting nitrogen ice. While that ice layer adds some mass to the basin, it isn’t thick enough on its own to make Sputnik Planum have positive mass.
The rest of that mass, Johnson said, may be generated by a liquid lurking beneath the surface.
Johnson and his team explained it like this:
Like a bowling ball dropped on a trampoline, a large impact creates a dent on a planet’s surface, followed by a rebound. That rebound pulls material upward from deep in the planet’s interior. If that upwelled material is denser than what was blasted away by the impact, the crater ends up with the same mass as it had before the impact happened. This is a phenomenon geologists refer to as isostatic compensation.
Water is denser than ice. So if there were a layer of liquid water beneath Pluto’s ice shell, it may have welled up following the Sputnik Planum impact, evening out the crater’s mass. If the basin started out with neutral mass, then the nitrogen layer deposited later would be enough to create a positive mass anomaly.
“This scenario requires a liquid ocean,” Johnson said. “We wanted to run computer models of the impact to see if this is something that would actually happen. What we found is that the production of a positive mass anomaly is actually quite sensitive to how thick the ocean layer is. It’s also sensitive to how salty the ocean is, because the salt content affects the density of the water.”
The models simulated the impact of an object large enough to create a basin of Sputnik Planum’s size hitting Pluto at a speed expected for that part in the solar system. The simulation assumed various thicknesses of the water layer beneath the crust, from no water at all to a layer 200 kilometers thick.
The scenario that best reconstructed Sputnik Planum’s observed size depth, while also producing a crater with compensated mass, was one in which Pluto has an ocean layer more than 100 kilometers thick, with a salinity of around 30 percent.
“What this tells us is that if Sputnik Planum is indeed a positive mass anomaly —and it appears as though it is — this ocean layer of at least 100 kilometers has to be there,” Johnson said. “It’s pretty amazing to me that you have this body so far out in the solar system that still may have liquid water.”
Johnson he and other researchers will continue study the data sent back by New Horizons to get a clearer picture Pluto’s intriguing interior and possible ocean.
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“X” marks the spot that’s illustrative of “convective churning” resulting from subsurface planetary heating, as seen in a fascinating new super high resolution image received from NASA’s New Horizons spacecraft on Christmas Eve, Dec. 24, 2015. Its situated at the very center of the left ventricle of Pluto’s huge “heart” – an icy flow plain that’s informally named “Sputnik Planum.”
The “X” feature – see image above – is located in an area of intersecting cells, shaped like polygons, on the plains of “Sputnik Planum” which are mostly comprised of frozen nitrogen ices.
So what’s really piqued the interest of scientists leading the New Horizons mission, is that the “X” feature is a residue of “convective churning” or internal heating and it has changed over time.
Indeed the “X” is found at what appears to be the melted remnants of a quadruple junction of the polygonal or cellular patterns, that dominate Sputnik Planum. And it’s not tiny!
“This part of Pluto is acting like a lava lamp,” said William McKinnon, deputy lead of the New Horizons Geology, Geophysics and Imaging team, from Washington University in St. Louis, “if you can imagine a lava lamp as wide as, and even deeper than, the Hudson Bay.”
The polygonal cell features are believed to have arisen over time from the slow thermal convection of the icy plains that are composed of a slushy mixture of mostly nitrogen ices along with some water ice mixed in.
The image was taken by the probes telescopic Long Range Reconnaissance Imager (LORRI) at a distance of approximately 10,000 miles (17,000 kilometers), about 15 minutes before New Horizons’ closest approach to Pluto.
Scientists currently interpret the dark patch near the top of the image to be a dirty water “iceberg” that’s “floating in denser solid nitrogen, and which has been dragged to the edge of a convection cell.” Also visible are thousands of surface pits arising from sublimation.
New Horizons made history when it became Earth’s first emissary to hurtle past the small planet on July 14, 2015.
Pluto – also now known as the ‘Other Red Planet’ – was the last unexplored planet in our solar system.
The LORRI image nearly completes a mosaic of New Horizons’ highest-resolution images taken of Pluto along a swath at the center of Sputnik Planum. They have a resolution of about 250-280 feet (77-85 meters) per pixel – “revealing features smaller than half a city block on Pluto’s surface,” according to the team in a NASA statement.
The newly released images, from NASA and the New Horizons team, illustrate the polygonal or cellular pattern of the plains, which “are thought to result from the convective churning of a deep layer of solid, but mobile, nitrogen ice.”
The LORRI images also reveal numerous, active triple junctions spread across the terrain.
Based on the data returned thus far, researcher say “the pattern of the cells stems from the slow thermal convection of the nitrogen-dominated ices that fill Sputnik Planum.”
“Computer models by the New Horizons team show that these blobs of overturning solid nitrogen can slowly evolve and merge over millions of years.”
The nitrogen ices rise and sink over time forming ridges along the edges of the polygonal cells that change with time due to the subsurface heating.
The polygons range in width from to 25 miles (16 to 40 kilometers). They are somewhat dome-like and rise slightly about 100 yards (100 meters) in the center.
Researchers say Sputnik Planum itself is likely several miles or kilometers deep in some places and the icy plains are a few miles lower that the surrounding areas on Pluto.
“The solid nitrogen is warmed at depth by Pluto’s modest internal heat, becomes buoyant and rises up in great blobs, and then cools off and sinks again to renew the cycle.”
The “Sputnik Planum” region dominates the left side of Pluto’s “heart-shape” feature informally dubbed “Tombaugh Regio.”
So far New Horizon has transmitted back only about 20 percent of the data gathered, according to mission Principal Investigator Alan Stern of the Southwest Research Institute, Boulder, Colorado.
“It’s hard to imagine how rapidly our view of Pluto and its moons are evolving as new data stream in each week. As the discoveries pour in from those data, Pluto is becoming a star of the solar system,” says Stern.
“Moreover, I’d wager that for most planetary scientists, any one or two of our latest major findings on one world would be considered astounding. To have them all is simply incredible.”
The piano shaped probe gathered about 50 gigabits of data as it hurtled past Pluto, its largest moon Charon and four smaller moons.
Stern says it will take about a year for all the data to get back. Thus bountiful new discoveries are on tap for a long time to come.
During New Horizons flyby on July 14, 2015, it discovered that Pluto is the biggest object in the outer solar system and thus the ‘King of the Kuiper Belt.”
The Kuiper Belt comprises the third and outermost region of worlds in our solar system.
New Horizons remains on target to fly by a second Kuiper Belt Object (KBO) on Jan. 1, 2019 – tentatively named PT1, for Potential Target 1. It is much smaller than Pluto and was recently selected based on images taken by NASA’s Hubble Space Telescope.
Stay tuned here for Ken’s continuing Earth and planetary science and human spaceflight news.
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The possible discovery of a pair of recently erupting ice volcanoes on Pluto are among the unexpected “astounding” findings just unveiled by perplexed scientists with NASA’s New Horizons spacecraft, barely four months after the historic first flyby of the last unexplored planet in our solar system. “Nothing like this has been seen in the deep […]
Even though the New Horizons spacecraft hasn’t officially been approved to do a flyby of a distant Kuiper Belt Object in about 3 years, the engineering team has now performed two maneuvers in a series of four to direct the spacecraft towards an ancient and distant KBO named 2014 MU69. “Second of four engine burns […]