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    polar cap tagged posts

    Webb Rings in Holidays with Ringed Planet Uranus

    December 19, 2023, Categories  Astronomy/Space

    The planet Uranus on a black background. The planet appears blue with a large, white patch taking up the right half. The patch is whitest at the center, then fades into blue at it expands from right to left. A thin outline of Uranus is also white. Around the planet is a system of nested rings. The outermost ring is the brightest while the innermost ring is the faintest. Unlike Saturn’s horizontal rings, the rings of Uranus are vertical and so they appear to surround the planet in an oval shape. There are 9 blueish white dots scattered around the rings.
    This image of Uranus from NIRCam (Near-Infrared Camera) on NASA’s James Webb Space Telescope exquisitely captures Uranus’s seasonal north polar cap and dim inner and outer rings. This Webb image also shows 9 of the planet’s 27 moons – clockwise starting at 2 o’clock, they are: Rosalind, Puck, Belinda, Desdemona, Cressida, Bianca, Portia, Juliet, and Perdita.
    NASA, ESA, CSA, STScI

    The James Webb Space Telescope recently trained its sights on unusual and enigmatic Uranus, an ice giant that spins on its side. Webb captured this dynamic world with rings, moons, storms, and other atmospheric features—including a seasonal polar cap. The image expands upon a two-color version released earlier this year, adding additional wavelength coverage for a more detailed look.

    With its exq...

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    Layering, not Liquid: Astronomers explain Mars’ Watery Reflections

    September 27, 2022, Categories  Astronomy/Space

    Martian South Pole Layered Deposit
    This image from NASA’s Mars Reconnaissance Orbiter shows the edge of the Martian South Pole Layered Deposit. The stack of fine layering is highlighted by the rays of the polar sun.

    Cornell astronomers believe bright reflections beneath the surface of Mars’ South Pole are not necessarily evidence of liquid water, but instead geological layers.

    Researchers detail their alternative explanation in Nature Astronomy.

    “On Earth, reflections that bright are often an indication of liquid water, even buried lakes like Lake Vostok,” said Dan Lalich, research associate. “But on Mars, the prevailing opinion was that it should be too cold for similar lakes to form.”

    But the fact remains, Lalich said, that the bright reflection exists and requires an explanation.

    Lalich created simulati...

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