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1. Artist concept showing sand-laden jets shoot into the Martian polar sky. By noted space artist Ron Miller. 2. Image of north polar ice cap taken by NASA Mars Reconnaissance Orbiter (MRO) in 2021. https://www.jpl.nasa.gov/images/pia24390-spring-sprouts-on-mars/ A layer of dry ice covers the sand dunes in this image. Gas jets sprout through the ice layer carrying dust and sand from the surface, showing up as dark fans. At this time in early Martian spring, the fans are visible between the sand dunes. The ground between the dunes is on the scale of tens of centimeters, and ice in places where the sun hits more directly will thin fastest, releasing the jets. Later, the ice over and around the dunes will rupture and more fans will appear on the dunes.

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  1. Embed this notice
    AkaSci 🛰️ (akasci@fosstodon.org)'s status on Monday, 18-Nov-2024 00:18:44 JST AkaSci 🛰️ AkaSci 🛰️
    in reply to

    Each spring, jets of CO2 gas erupt from the Martian polar ice caps, carrying dark sand and dust high aloft, which fall back to the surface creating dark patches.

    Over winter, a layer of frozen CO2 forms over the permanent ice caps, with dust and sand trapped underneath. Spring sunlight warms and sublimates the ice near the dust layer, creating pockets of pressurized gas, which erupt thru weak spots in the layer.
    The artist's impression below imagines the scene.
    https://themis.asu.edu/news/gas-jets-spawn-dark-spiders-and-spots-mars-icecap
    #Mars
    2/n

    In conversation about 8 months ago from fosstodon.org permalink
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GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.

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