Скачать с ютуб Spiders on Mars & Europa: Insights for Icy Planetary Surface Processes through Analog Experiments в хорошем качестве

Spiders on Mars & Europa: Insights for Icy Planetary Surface Processes through Analog Experiments

Dendritic, fractal patterns form on Earth within systems of growth, typically driven by a physical gradient, e.g. river drainage networks. Recently, similar patterns have been detected on planetary surfaces. South polar `spiders’ on Mars are thought to form via a solid-state-greenhouse effect, where trapped gas beneath seasonal CO2 ice rushes towards a vent, scouring the substrate, while the origin of a peculiar asterisk-shaped `spider’ in Europa’s Manannán crater is uncertain. In her talk, Lauren presents on experiments to test the formation of both spiders on Mars and Europa. In her Mars experiments, she condense CO2 ice on granular substrate in a planetary simulation chamber and insolate it to form spider patterns. By reconciling empirical observations with remote-sensing high resolution imagery, she investigates controls on their different morphologies and whether they are active features, or relicts from a past climate. Lauren also presents a new hypothesis for the formation of Europa’s Manannán spider, using `lake stars’ as a terrestrial analog, as well as experiments and field work in Breckenridge, Colorado to test this. These small—scale experiments exemplify how, despite the issue of equifinality, scientists can understand extant surface processes through comparative planetology – on the large and small scale. Lauren McKeown is a planetary geomorphologist from Dublin, Ireland studying icy surface processes on Mars and Europa through laboratory analog work and remote-sensing image analysis. She has a cross-disciplinary background, with a PhD in Planetary Science from Trinity College, Dublin and an undergraduate degree in Physics with Astronomy and Space Science from University College Dublin. Specifically, Lauren is interested in better understanding the formation of `spiders’ (more formally known as araneiforms). These are Martian features that have no Earth analogs and are formed by the interaction between seasonal dry ice sublimation and granular substrate. As a JPL Postdoctoral Fellow, she is investigating the relationship between distinct morphologies of spiders and specific local environmental conditions – past and present. Lauren also uses a comparative-planetology approach to understanding the origin of a `spider-like’ feature on Europa. She is interested in active and recent surface features and landforms on Mars and have applied mapping and morphological analysis techniques to linear dune gullies and their associated pits, as well as potentially periglacial environments. Lauren is also working on getting more involved in mission development as a Europa Clipper Project Science Affiliate and Mars Reconnaissance Orbiter HiRISE Team Affiliate. Laruen enjoys teaching and mentoring and have previously worked as a tenured lecturer in planetary surfaces at Birkbeck, University of London. She also has research experience at NASA Ames, The Open University and The Natural History Museum, London and project management experience at a tech startup spun out of The University of Cambridge. Lauren enjoys working with the media to share my research with the general public.