• ES Picture of the Day 22 2023

    From Black Panther@21:1/186 to All on Sun Jan 22 11:01:06 2023
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    3-D View of DNA

    January 20, 2023


    DNA _ stereo card _Forums

    Photographer: Greg Parker

    Summary Author: Greg Parker

    Featured above is a 3-D view ( stereograph) of 2 and a half turns of
    the DNA molecule. I put together this 3-D model from a
    Cochranes of Oxford kit, and Dr. Brian May created the
    stereograph – in mid-December of 2022. A DNA molecule consists of two
    long polynucleotide strands or chains made up of four types of
    nucleotide subunits. Each such molecule contains the biological
    information responsible for making every species unique.

    You can view the stereograph by:
    1. Using the Cross-Eyed method
    2. Using 3D prism glasses
    3. Using B rian May’s OWL Stereoscope



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    Animal Links

    * Animal Diversity Web
    * ARKive
    * BirdLife International
    * Bug Guide
    * Discover Life
    * Integrated Taxonomic Information System
    * Microbial Life Resources
    Earth Science Picture of the Day is a service of the
    -
    Universities Space Research Association.

    https://epod.usra.edu

    --- up 46 weeks, 6 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)
  • From Black Panther@21:1/186 to All on Wed Feb 22 11:01:08 2023
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.


    Spiral Pattern on an Icy Puddle

    February 22, 2023

    Ice spiral

    Photographer: Mark Hendrickson

    Summary Authors: Mark Hendrickson; Jim Foster

    I’ve have seen concentric ice rings in puddles, but this is the
    first true spiral I’ve observed. This photo was taken about 17 miles
    (27 km) northeast of Payson, Arizona on January 21, 2023. The overnight
    low was 18ºF (-8 C), and at the time of the photo the temperature had
    climbed to 28ºF (-2 C). The surface of the puddle was about 2 ft (.6 m)
    across and was completely frozen. It's very likely that the ice didn't
    reach the bottom of this little puddle.

    A number of factors can lead to odd patterns on icy surfaces. Note
    the fractures (white lines) in the ice at left, in the only ring not
    part of the spiral formation. The next ring starts the actual spiral.
    So, it seems that there was an initial sheet across the puddle, and
    when the ice became sufficiently thick (perhaps a few mm) only one more
    crack formed. With just a single crack, as the water beneath
    transferred to the ice and shrunk (contracted) toward the center, the
    crack grew and spiraled inward. However, exactly how these spirals
    formed is still a bit of a mystery. Thanks to Steven Arcone and Doug
    Stith for their help with this.


    Payson, Arizona Coordinates: 34.2309, -111.3251


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    Cryosphere Links

    * Guide to Frost
    * What is the Cryosphere?
    * Bentley Snow Crystals
    * Glaciers of the World
    * Ice, Snow, and Glaciers: The Water Cycle
    * The National Snow and Ice Data Center Google Earth Images
    * Snow and Ice Crystals

    -
    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.

    https://epod.usra.edu

    --- up 51 weeks, 2 days, 21 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)