Young Volcanoes on the Moon   
       
   Nov 24, 2014: Back in 1971, Apollo 15 astronauts orbiting the Moon   
   photographed something very odd.  Researchers called it "Ina," and it looked   
   like the aftermath of a volcanic eruption.   
       
   There's nothing odd about volcanoes on the Moon, per se.  Much of the Moon's   
   ancient surface is covered with hardened lava. The main features of the "Man   
   in the Moon," in fact, are old basaltic flows deposited billions of years ago   
   when the Moon was wracked by violent eruptions. The strange thing about Ina   
   was its age.   
       
   Planetary scientists have long thought that lunar volcanism came to an end   
   about a billion years ago, and little has changed since. Yet Ina looked   
   remarkably fresh. For more than 30 years Ina remained a mystery, a "one-off   
   oddity" that no one could explain.   
       
   Turns out, the mystery is bigger than anyone imagined. Using NASA's Lunar   
   Reconnaissance Orbiter, a team of researchers led by Sarah Braden of Arizona   
   State University has found 70 landscapes similar to Ina.  They call them   
   "Irregular Mare Patches" or IMPs for short.   
       
   https://www.youtube.com/watch?v=53TGz30Z1sM&feature=youtu.be   
       
   A new ScienceCast video explores the mystery of recent lunar volcanism. Play it   
       
   "Discovering new features on the lunar surface was thrilling!" says Braden.   
   "We looked at hundreds of high-resolution images, and when I found a new IMP   
   it was always the highlight of my day."   
       
   "The irregular mare patches look so different than more common lunar features   
   like impact craters, impact melt, and highlands material," she says.  "They   
   really jump out at you."   
       
   On the Moon, it is possible to estimate the age of a landscape by counting its   
   craters.  The Moon is pelted by a slow drizzle of meteoroids that pepper its   
   surface with impact scars.  The older a landscape, the more craters it   
   contains.   
       
   Some of the IMPs they found are very lightly cratered, suggesting that they   
   are no more than 100 million years old. A hundred million years may sound like   
   a long time, but in geological terms it's just a blink of an eye. The volcanic   
   craters LRO found may have been erupting during the Cretaceous period on   
   Earth--the heyday of dinosaurs. Some of the volcanic features may be even   
   younger, 50 million years old, a time when mammals were replacing dinosaurs as   
   dominant lifeforms.   
       
   "This finding is the kind of science that is literally going to make   
   geologists rewrite the textbooks about the Moon," says John Keller, LRO   
   project scientist at the Goddard Space Flight Center.   
       
   IMPs are too small to be seen from Earth, averaging less than a third of a   
   mile (500 meters) across in their largest dimension.  That's why, other than   
   Ina, they haven't been found before.  Nevertheless, they appear to be   
   widespread around the nearside of the Moon.   
       
   "Not only are the IMPs striking landscapes, but also they tell us something   
   very important about the thermal evolution of the Moon," says Mark Robinson of   
   Arizona State University, the principal investigator for LRO's high resolution   
   camera. "The interior of the Moon is perhaps hotter than previously thought."   
       
   "We know so little of the Moon!" he continues. "The Moon is a large mysterious   
   world in its own right, and its only three days away! I would love to land on   
   an IMP and take the Moon's temperature first-hand using a heat probe."   
       
   Some people think the Moon looks dead, "but I never thought so," says   
   Robinson, who won't rule out the possibility of future eruptions. "To me, it   
   has always been an inviting place of magnificent beauty, a giant magnet in our   
   sky drawing me towards it."   
       
   Young volcanoes have only turned up the heat on the Moon's allure. Says   
   Robinson . "let's go!"   
       
   Credits:   
   Author: Dr. Tony Phillips | Production editor: Dr. Tony Phillips | Credit:   
   Science@NASA   
       
       
   Regards,   
       
   Roger   
      
   --- D'Bridge 3.99   
    * Origin: NCS BBS - Houma, LoUiSiAna (1:3828/7)