We can interpret this amazing image of a forming solar system (HL Tauri, from the Alma array; ESO 2014).
Iron meteorites with #taenite and #kamacite domains forming a Widmanstätten pattern tell us that in systems like this or our own solar system:
–planetesimals had already formed and differentiated, while a heat source (decay of 26-Al) was still available.
–they were on the order of 100's of km in diameter, with enough rock to insulate the slowly-cooling core.
The solid-state diffusion of iron and nickel into #taenite and #kamacite domains forms the Widmanstätten pattern in iron meteorites. The growth of these domains has been calibrated with temperature.
The meteorite pictured (Tambo Quemado, Peru, type IIIB) suggests a cooling rate of 1.2 °C per million years; modelling suggests this occurred in a planetesimal ~ 200 km in radius (which was later disrupted and fragments of the core exposed to space) (Goldstein & Short, 1967).
#MinCup25 #Meteorite
В 2020 году появились четыре новые группировки, атаковавшие АСУ ТП #Dragos, #APT, #Vanadinite, #Talonite, #Kamacite, #Stibnite https://t.co/doyQhKIHkL https://t.co/XhCDc0zOnm
Источник: https://twitter.com/SecurityLabnews/status/1365202449825431552
Bill Minarik
SecurityLab