4 ms·

What I want to see is the Theia collision rendered in realistic 3D (and if there was enough gas around for sound to carry, that too!) https://en.wikipedia.org

by ck2 2y ago

What I want to see is the Theia collision rendered in realistic 3D (and if there was enough gas around for sound to carry, that too!) https://en.wikipedia.org/wiki/Theia_(planet) https://en.wikipedia.org/wiki/Theia_(planet) I guess this is close but not like the Hollywood blockbuster it should be https://www.youtube.com/watch?v=kRlhlCWplqk https://www.youtube.com/watch?v=kRlhlCWplqk https://www.nasa.gov/solar-system/collision-may-have-formed-the-moon-in-mere-hours-simulations-reveal/ https://www.nasa.gov/solar-system/collision-may-have-formed-...

dredmorbius 2y ago
Watching the Nasa sim, and others I've seen multiple times before, thought occurs that by re-liquifying much of the Earth after its initial formation, heavier elements which had otherwise been trapped in the crust / upper mantle might have re-mobilised and sunk deeper into the core. I'm not sure of relative abundance of elements in the crusts of other rocky worlds, though at least generally Mars seems to have a greater prevalence of iron, and fewer of the lighter metals, in its own crust. See: <https://earthscience.stackexchange.com/a/20711 https://earthscience.stackexchange.com/a/20711> Citing: Arya Udry, Esteban Gazel, and Harry Y. McSween Jr., "Formation of Evolved Rocks at Gale Crater by Crystal Fractionation and Implications for Mars Crustal Composition", Journal of Geophysical Research: Planets 123 (2018), Issue 6, pp. 1525-1540. <https://doi.org/10.1029/2018JE005602 https://doi.org/10.1029/2018JE005602> Harry Y. McSween Jr.1,G. Jeffrey Taylor, and Michael B. Wyatt, "Elemental Composition of the Martian Crust", Science 324 (2009), Issue 5928, pp. 736-739. <https://science.sciencemag.org/content/324/5928/736 https://science.sciencemag.org/content/324/5928/736> (The fact that we now have geological studies of multiple specific regions of Mars delights me.)

by ck2 2y ago

dredmorbius 2y ago

Watching the Nasa sim, and others I've seen multiple times before, thought occurs that by re-liquifying much of the Earth after its initial formation, heavier elements which had otherwise been trapped in the crust / upper mantle might have re-mobilised and sunk deeper into the core. I'm not sure of relative abundance of elements in the crusts of other rocky worlds, though at least generally Mars seems to have a greater prevalence of iron, and fewer of the lighter metals, in its own crust. See: <https://earthscience.stackexchange.com/a/20711 https://earthscience.stackexchange.com/a/20711> Citing: Arya Udry, Esteban Gazel, and Harry Y. McSween Jr., "Formation of Evolved Rocks at Gale Crater by Crystal Fractionation and Implications for Mars Crustal Composition", Journal of Geophysical Research: Planets 123 (2018), Issue 6, pp. 1525-1540. <https://doi.org/10.1029/2018JE005602 https://doi.org/10.1029/2018JE005602> Harry Y. McSween Jr.1,G. Jeffrey Taylor, and Michael B. Wyatt, "Elemental Composition of the Martian Crust", Science 324 (2009), Issue 5928, pp. 736-739. <https://science.sciencemag.org/content/324/5928/736 https://science.sciencemag.org/content/324/5928/736> (The fact that we now have geological studies of multiple specific regions of Mars delights me.)