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A 4.4 billion-year-old zircon crystal is providing new insight into how the early Earth cooled from a ball of magma and formed continents just 160 million years after the formation of our solar system, much earlier than previously believed.
Read more at: phys.org...
The study, according to Valley, strengthens the theory of a "cool early Earth," where temperatures were low enough for liquid water, oceans and a hydrosphere not long after the planet's crust congealed from a sea of molten rock. "The study reinforces our conclusion that Earth had a hydrosphere before 4.3 billion years ago," and possibly life not long after, says Valley.
Read more at: phys.org...
If our planet was possibly habitable just 160 million years after the formation of our solar system than to me it would seem that life could potentially be almost as old as the solar system its self. And its not that crazy of an idea to postulate that life could have been forming elsewhere in the solar system. Perhaps mars or other bodies that are now lifeless . But I Digress....BTW Here is a pic of the crystal they tested, the thing even looks ancient.
reply to post by intrptr
I think that's a fair assessment, unless we were wrong about a couple of things in our assumptions? If so, what assumptions would those be?
As I think everything is the center of the universe though nothing is the really the center of it. Eye of the beholder idea of sorts, still not.
Also kind of hard for me to work out the correct set of words as I have to translate everything I say from Icelandic and the advanced English scientific terms aren't my strongest field.
One wonders, if we were wrong how fast things form at the beginning.
And on a side note I looked up The growth factor by meteoric waste there's actually a formula for it. When I'm not on my phone I'll see if I can post it. Now I know you said you werent mathematical and neither am i however I'm sure someone can come up with a rough estimate based on the equation. Ill get back to you when my internet comes back up.
Jack Hills Fm: Sedimentary siliciclastic rocks, interpreted as alluvial fan-delta deposits, are the major lithology. Minor mafic/ultramafic rocks and banded iron formation (BIF) are also found in the sequence. The overall sequence is generally considered to be a granulite gneiss, which has undergone multiple deformations and multiple metamorphic episodes. The protolith age of the Narryer Gneiss Terrane is variable, but generally considered to be in excess of 3.6 Ga (billion years).
IN ordinary circumstances, about three meteors are visible per hour at a given place. Such average meteors are visible at a distance of at least 100 km., and their mass seems to be in the neighbourhood of 6 × 10-3 gm.1. Thus the mass falling per hour on an area of order 3 × 1014 cm.2is about 2 × 10-2 gm. ; or 6 × 10-17 gm. per square centimetre. Taking the density as 3, we find that the rate of accumulation is 2 × 10-17 cm. thickness per hour or 2 × 10-5 cm. in 100 million years.