Dating rocks from the moon book dating esther fl guest mary

Posted by / 15-Nov-2019 03:56

Dating rocks from the moon

The impact that formed the Moon could have been large enough to wipe out any living thing on Earth, so knowing when that collision occurred is important if we hope to understand the evolution of our own planet, and when early life took root here.And the new research suggests that it happened earlier in the timeline of the Solar System than we thought - just 60 million years after our star system's birth, compared to previous estimates of 150 to 200 million years afterwards.By analyzing the growth history of those planets from 259 simulations, they discovered a relationship between the time the Earth was impacted and the amount of material added to our planet after that collision.You see, after the big moon-forming impact, proto-Earth was smashed into by other, smaller objects -- these caused the Earth to gain some mass later on.To achieve this revised date, an international team led by Seth Jacobson from Observatoire de la Côte d’Azur in Nice, France, devised a new method based on measurements of the Earth’s interior combined with computer simulations of the protoplanetary disk from which the Earth and other planets formed.They started by simulating the growth of the “terrestrial planets” Mercury, Venus, Earth, and Mars from the planetary building blocks orbiting the Sun.

In case you need a refresher, the Moon is thought to have formed from the leftover matter that was sheared off Earth after a collision with Theia - a planet-sized object that existed in the early Solar System - or perhaps a bunch of smaller objects.So they constrained their model with the concentration of highly “siderophile” elements (elements like platinum and iridium that like to be chemically associated with iron).Previous work has shown that these are proportional to the mass accumulated on Earth post-impact.Scientists trying to date this moon-forming impact have come up with a wide range of ages: from as early as 30 million years after the birth of the solar system to as late as 100 million years after the Milky Way was formed.That makes the moon millions and millions of years younger than some previous estimates, which were based on radioactive dating of elements like uranium.

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Once formed, zircon crystals stay perfectly intact as little time signatures of geological events.

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