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    water ice tagged posts

    Opal discovered in Antarctic Meteorite

    June 27, 2016, Categories  Astronomy/Space

    Images of one of the many pieces of opal found in meteorite EET 83309. At top right is a backscattered electron image (the long thin dark object is opal). At bottom left is an image of silica concentrations in opal and surrounding meteoritic minerals. At top left is an image of oxygen concentrations in opal and surrounding minerals. At bottom right is an image nickel concentrations in opal and surrounding minerals. Credit: H. Downes

    Images of one of the many pieces of opal found in meteorite EET 83309. At top right is a backscattered electron image (the long thin dark object is opal). At bottom left is an image of silica concentrations in opal and surrounding meteoritic minerals. At top left is an image of oxygen concentrations in opal and surrounding minerals. At bottom right is an image nickel concentrations in opal and surrounding minerals. Credit: H. Downes

    Planetary scientists have discovered pieces of opal in a meteorite found in Antarctica, a result that demonstrates that meteorites delivered water ice to asteroids early in the history of the solar system. Led by Professor Hilary Downes of Birkbeck College London, the team announce their results at the National Astronomy Meeting in Nottingham on Monday 27 June.

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    What’s Eating at Pluto?

    March 12, 2016, Categories  Astronomy/Space

    In this image, north is up. The southern portion of the left inset above shows the cratered plateau uplands informally named Vega Terra (note that all feature names are informal). A jagged scarp, or wall of cliffs, known as Piri Rupes borders the young, nearly crater-free plains of Piri Planitia. The cliffs break up into isolated mesas in several places. Credit: Image courtesy of NASA

    In this image, north is up. The southern portion of the left inset above shows the cratered plateau uplands informally named Vega Terra (note that all feature names are informal). A jagged scarp, or wall of cliffs, known as Piri Rupes borders the young, nearly crater-free plains of Piri Planitia. The cliffs break up into isolated mesas in several places. Credit: Image courtesy of NASA

    Far in the western hemisphere, scientists on NASA’s New Horizons mission have discovered what looks like a giant “bite mark” on Pluto’s surface. They suspect it may be caused by a process known as sublimation – transition of a substance from a solid to a gas. The methane ice-rich surface on Pluto may be sublimating away into the atmosphere, exposing a layer of water-ice underneath.

    Cutting diagonally across t...

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    Pluto’s ‘Hulk-like’ Moon Charon: A possible Ancient Ocean?

    February 19, 2016, Categories  Astronomy/Space

    Pluto's Moon Charon

    A close-up of the canyons on Charon, Pluto’s big moon, taken by New Horizons during its close approach to the Pluto system last July. Multiple views taken by New Horizons as it passed by Charon allow stereo measurements of topography, shown in the color-coded version of the image. The scale bar indicates relative elevation. Credits: NASA/JHUAPL/SwRI

    Pluto’s largest moon may have gotten too big for its own skin. Images from NASA’s New Horizons mission suggest Pluto’s moon Charon once had a subsurface ocean that has long since frozen and expanded, pushing outward and causing the moon’s surface to stretch and fracture on a massive scale...

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