Add Kruttasch-Mezger to the growing pile of evidence that Earth formed inside the soot line. From Bern's presser, which admittedly is imprecise over carbon.
From the 53Mn-to-53Cr clock, Earth must have coalesced into a cooling ball within three million years. This has a serious knock-on effect: Earth (and Venus) formed where volatiles like nitrogen, ammonia, and methane could not exist. Nor could the big one: water. Carbon doesn't melt or vaporise at these temperatures but tends to mix with such volatiles to make hydrocarbons, which do.
Therefore the volatiles we got, down here beneath Mars, must have been transported hither. The study proposes Theia for us. It could hardly... not. The same must be true of Venus.
I am less sure of Mars. It has trouble keeping its volatiles to this day given its low gravity and room-temperature summer days. On the one hand, congratulations for providing something close to our null-hypothesis. On the other hand: how much of these molecules were delivered in the old days and when?
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