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https://twitter.com/drphiltill/status/17735511657261592032/ The papers described how those small experiments give physics insight that leads to a new equation predicting erosion rate when there is no saltation. I took that new equation and applied it to the Apollo Lunar Modules to predict how much soil was blowing.
https://twitter.com/spacedotcom/status/17696958512977882802/ Or is it from blowing dust plowing across the surface? Or from engine shutoff when the last sputter of the engine cause a low velocity blanket of dust to fly out to a much smaller distance than normal? The problem has always been that this blast zone is *too small* to be…
https://twitter.com/pinboard/status/17686883527173655012/ The thing about using regolith for shielding is that you use it when you are on the surface of a planet, and there’s so much available and you do t carry it on a spaceship so you have no reason to use a thin amount. It entirely solves the problem!
https://twitter.com/johnfkross2/status/17616237758737942592/ When I was at NASA, one of the things I was doing was writing solicitations to industry to write physics-based code to do CFD without Navier-Stokes. There are many ways to treat the fundamental physics (the Boltzmann Transport Equation) and they all work for different…
https://twitter.com/drphiltill/status/16585078548593377372/ It took 8.5 months from the breakthrough while sitting at McDonalds until I got the paper done. 😭 I had to re-do it several times. 💀
https://twitter.com/latifnasser/status/17509528601317295442/ An example of a moon that changed orbits: Triton. It is currently a moon of Neptune but previously it was a primary planet orbiting the Sun directly (albeit a small planet…a dwarf planet like Pluto). Neptune captured it!
https://twitter.com/spcplcyonline/status/17494724764032123612/ As the article explains. Turner’s thesis is that the US Western frontier created an open democratic society of self-reliant individuals with strong moral fiber. It says the western frontier values diffused back east to keep the rest of the US from falling into degeneracy, too.
https://twitter.com/matthew_pines/status/17411820704145942582/ …is so far ahead of us that they could travel between stars is way, way beyond the point that it becomes completely unpredictable. Therefore, any models we might create for what the tech could look like (how they might get here, how they might refuel…) are unconstrained.
https://twitter.com/drchriscombs/status/17271846198865554842/ Each nozzle has a plume (a jet) that is slightly mismatched relative to surrounding air pressure, so they oscillate in diameter, widening and narrowing to try to match pressure, but overshooting each time so they oscillate. These are the Mach diamonds.
https://twitter.com/brianjji/status/17198974258531618752/…you have to tell yourself that nature is not irrational; there is always an explanation, and it can always be found. Someone will find it, and that person can be me.