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    reflected light tagged posts

    Cosmic barbecue: Researchers spot 60 new ‘hot Jupiter’ candidates

    July 8, 2017, Categories  Astronomy/Space

    The diagram above shows a hot Jupiter at various phases of its orbit. The sizes of the star and planet and the separations between them are to scale for a typical hot Jupiter. The amount of reflected starlight that is observed depends on the planet's position within its orbit and the inclination of the orbit with respect to the observer.

    The diagram above shows a hot Jupiter at various phases of its orbit. The sizes of the star and planet and the separations between them are to scale for a typical hot Jupiter. The amount of reflected starlight that is observed depends on the planet’s position within its orbit and the inclination of the orbit with respect to the observer.

     
    Yale researchers have identified 60 potential new “hot Jupiters” — highly irradiated worlds that glow like coals on a barbecue grill and are found orbiting only 1% of Sun-like stars. Hot Jupiters constitute a class of gas giant planets located so close to their parent stars that they take less than a week to complete an orbit. Second-year Ph.D...
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    Making 3D objects Disappear: Ultrathin Invisibility Cloak created

    September 18, 2015, Categories  Physics, Technology/Electronics

    This image shows a 3-D illustration of a metasurface skin cloak made from an ultrathin layer of nanoantennas (gold blocks) covering an arbitrarily shaped object. Light reflects off the cloak (red arrows) as if it were reflecting off a flat mirror. Credit: Image courtesy of Xiang Zhang group, Berkeley Lab/UC Berkeley

    This image shows a 3-D illustration of a metasurface skin cloak made from an ultrathin layer of nanoantennas (gold blocks) covering an arbitrarily shaped object. Light reflects off the cloak (red arrows) as if it were reflecting off a flat mirror. Credit: Image courtesy of Xiang Zhang group, Berkeley Lab/UC Berkeley

    It conforms to the shape of an object and conceal it from detection with visible light. Although this cloak is only microscopic in size, the principles behind the technology should enable it to be scaled-up to conceal macroscopic items as well.

    Working with brick-like blocks of gold nanoantennas, the Berkeley researchers fashioned a “skin cloak” barely 80nm in thickness, that was wrapped around a 3D object about the size of a few biological cells and arbitrarily shaped with mul...

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