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Traduction de https://www.sciencealert.com/scientists-reveal-origins-of-giant-object-that-smashed-into-earth
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Des scientifiques révèlent l'origine de l'objet géant qui a percuté la Terre
26 novembre 2025
Par Ivan FarkasLa proto-Terre victime d'une collision cosmique. (MPS/Mark A. Garlick)
Il y a environ 4,5 milliards d'années, un jour fatidique, un corps de la taille de Mars nommé Théia est entré en collision avec la proto-Terre, les transformant toutes deux en un amas de roches et de métaux en fusion. Deux objets distincts sont restés en orbite une fois les débris agglomérés : la Terre et sa Lune.
Mais d'où vient Théia ? De l'intérieur même du système solaire interne, plus chaud et plus confortable, semble-t-il. En fait, Théia et la proto-Terre étaient peut-être voisines ! Plus précisément Théia pourrait provenir d'une zone encore plus proche du Soleil que nous ne le sommes aujourd'hui ; peut-être même plus proche que la majeure partie des matériaux qui se sont accumulés pour former notre planète.
Ces découvertes sont issues d'une étude récente menée par des chercheurs de l'Institut Max Planck de recherche sur le système solaire (MPS) et de l'Université de Chicago. Les chercheurs ont analysé des échantillons terrestres, lunaires et de météorites afin de déterminer les proportions de nombreux isotopes, des versions plus légères ou plus lourdes d'un élément donné, possédant un nombre différent de neutrons dans leur noyau. "La composition d'un corps céleste retrace toute l'histoire de sa formation y compris son lieu d'origine" explique Thorsten Kleine, cosmochimiste au MPS.
Au fil du temps, les matériaux constituant une planète en refroidissement se déposent selon des modalités qui dépendent de leurs différences de masse, de leurs points de fusion, de leurs solubilités et de leurs affinités pour d'autres minéraux. Le fer et le zirconium, par exemple, se trouvent en concentrations variables dans les différentes couches de la Terre. Le fer, ainsi que le molybdène, un métal ayant des affinités pour le fer, se seraient rapidement enfoncés dans les profondeurs du noyau de la proto-Terre, s'y accumulant comme les joyaux précieux cachés dans le trésor d'un dragon médiéval. Le zirconium, en revanche, est resté dans le manteau durant toute l'existence de la Terre et n'a jamais atteint le noyau. Il est donc logique de penser qu'une grande partie du fer présent aujourd'hui dans le manteau terrestre est arrivée après la reformation de la planète, sans doute apporté par un impact cosmique cataclysmique.
Mais d'où provient cet objet porteur de fer ? En comparant les rapports isotopiques de différentes parties du système solaire, les chercheurs ont pu déduire une liste potentielle des composants de Théia et retracer son origine. Les variations au sein du nuage moléculaire géant qui a formé le Soleil et son disque protoplanétaire il y a des milliards d'années auraient également favorisé l'accumulation de différents éléments et isotopes. À l'instar d'une pâte à gâteau mal mélangée, ces proportions sont restées stables, constituant ainsi une signature chimique pour tout objet issu de la matière présente à cet endroit. La signature chimique de la Lune, composée de fer, de chrome, de calcium, de titane et de zirconium, correspond à celle de la Terre, obligeant les chercheurs à chercher ailleurs dans le système solaire des rapports isotopiques caractéristiques.
Les météorites sont spécifiques à leur lieu d'origine et, de par leur état primordial, constituent de véritables capsules temporelles cosmiques. Celles qui proviennent du Système solaire interne, ou du disque protoplanétaire, sont appelées météorites non carbonées (NC). Elles sont pierreuses et ont été débarrassées de leur carbone et autres matières volatiles par la chaleur intense dégagée par leur proximité avec le Soleil. Les météorites provenant du Système solaire externe sont appelées chondrites carbonées (CC). Elles se sont formées dans des environnements plus froids ce qui les rend plus riches en carbone avec de l'eau encore emprisonnée en leur sein.
Globalement, les rapports isotopiques du manteau terrestre correspondent à ceux des météorites du système solaire interne. Pourtant, les isotopes que les chercheurs ont attribués à Théia "présentent des rapports jusqu'alors inconnus et ne correspondent pas aux constituants fondamentaux de la Terre. Le scénario le plus convaincant est que la plupart des constituants fondamentaux de la Terre et de Théia proviennent du système solaire interne. La Terre et Théia étaient probablement voisines." conclut Timo Hopp, géoscientifique au MPS et auteur principal de l'étude.
La suite, comme on dit, appartient à l'histoire : la collision cataclysmique entre ces deux planètes voisines a donné naissance à notre Lune qui n'a cessé de s'éloigner de la Terre depuis lors, à une vitesse extrêmement lente, de 3,8 centimètres par an.
Ces travaux de recherche sont publiés dans la revue Science : https://www.science.org/doi/10.1126/science.ado0623.
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#Science #cosmologie #geologie -
Today's the birthday of Hippolyta, the queen of the Amazons (and the Golden Age Wonder Woman in a few continuities). (Also thrown in: Hippolyta "Lyta" Trevor of Earth-2.)
(Art by Paul Pelletier, Dario Brizuela, and Jerry Ordway.)
#1976DCCalendar #DCComics #comics #WonderWoman #TeenTitans #InfinityInc #ScoobyDoo
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Trevor Gibney of KOM Cycling groks the value of the Bicycling Monterey projects, including our project providing court-referred youth an alternative to paying hefty fines for traffic citations (https://bikemonterey.org/youth-bike-and-sometimes-receive-citations.html). On April 11, Trevor generously contributed a KOM Cycling Quick Release Light, 350 lumens, and Computer Mount (which also mounts light) in support of that project.
Below: Trevor and associate at KOM’s booth at Sea Otter Classic 2025. To learn about their Quick Release Lights, go to: https://komcycling.com/collections/cycling-lights
#BikeCommunity #MakeADifference #cycling #bicycling #biking #KOMCycling #BikeTooter #MontereyCounty
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Trevor Gibney of KOM Cycling groks the value of the Bicycling Monterey projects, including our project providing court-referred youth an alternative to paying hefty fines for traffic citations (https://bikemonterey.org/youth-bike-and-sometimes-receive-citations.html). On April 11, Trevor generously contributed a KOM Cycling Quick Release Light, 350 lumens, and Computer Mount (which also mounts light) in support of that project.
Below: Trevor and associate at KOM’s booth at Sea Otter Classic 2025. To learn about their Quick Release Lights, go to: https://komcycling.com/collections/cycling-lights
#BikeCommunity #MakeADifference #cycling #bicycling #biking #KOMCycling #BikeTooter #MontereyCounty
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Trevor Gibney of KOM Cycling groks the value of the Bicycling Monterey projects, including our project providing court-referred youth an alternative to paying hefty fines for traffic citations (https://bikemonterey.org/youth-bike-and-sometimes-receive-citations.html). On April 11, Trevor generously contributed a KOM Cycling Quick Release Light, 350 lumens, and Computer Mount (which also mounts light) in support of that project.
Below: Trevor and associate at KOM’s booth at Sea Otter Classic 2025. To learn about their Quick Release Lights, go to: https://komcycling.com/collections/cycling-lights
#BikeCommunity #MakeADifference #cycling #bicycling #biking #KOMCycling #BikeTooter #MontereyCounty
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Trevor Gibney of KOM Cycling groks the value of the Bicycling Monterey projects, including our project providing court-referred youth an alternative to paying hefty fines for traffic citations (https://bikemonterey.org/youth-bike-and-sometimes-receive-citations.html). On April 11, Trevor generously contributed a KOM Cycling Quick Release Light, 350 lumens, and Computer Mount (which also mounts light) in support of that project.
Below: Trevor and associate at KOM’s booth at Sea Otter Classic 2025. To learn about their Quick Release Lights, go to: https://komcycling.com/collections/cycling-lights
#BikeCommunity #MakeADifference #cycling #bicycling #biking #KOMCycling #BikeTooter #MontereyCounty
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Trevor Gibney of KOM Cycling groks the value of the Bicycling Monterey projects, including our project providing court-referred youth an alternative to paying hefty fines for traffic citations (https://bikemonterey.org/youth-bike-and-sometimes-receive-citations.html). On April 11, Trevor generously contributed a KOM Cycling Quick Release Light, 350 lumens, and Computer Mount (which also mounts light) in support of that project.
Below: Trevor and associate at KOM’s booth at Sea Otter Classic 2025. To learn about their Quick Release Lights, go to: https://komcycling.com/collections/cycling-lights
#BikeCommunity #MakeADifference #cycling #bicycling #biking #KOMCycling #BikeTooter #MontereyCounty
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Trevor Milton of Nikola Begins Trial in Fraud Case - Prosecutors say Trevor Milton, former chief executive of Nikola, lured retail investors w... - https://www.nytimes.com/2022/09/12/business/trevor-milton-nikola-trial.html #securitiesandcommoditiesviolations #electricandhybridvehicles #initialpublicofferings #miltontrevor(1981-) #trucksandtrucking #stocksandbonds #nikolamotorco #automobiles
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First excerpt of Trevor's second lp with Lords and Lady Kevin): "He lacked tact" from pending lp, "Des Touches"
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Thoughts and Interpretation of Trevor Bedford's Omicron thread
Bedford's a biostatistician at the Fred Hutchison Centre in Washington State. He posted data and analysis on Omicron a few days ago, with some very useful insights on spread
TL;DR: Spreading fast, 2.2--3.3 day doubling rates, 10x weekly growth, dominating Delta and other variants. #GetVaxxed #GetBoosted. No information on severity here.
https://joindiaspora.com/posts/009fcd7044e0013a76c7002590d8e506
Thread: https://threadreaderapp.com/thread/1471651826554470402.html
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Thoughts and Interpretation of Trevor Bedford's Omicron thread
Bedford's a biostatistician at the Fred Hutchison Centre in Washington State. He posted data and analysis on Omicron a few days ago, with some very useful insights on spread
TL;DR: Spreading fast, 2.2--3.3 day doubling rates, 10x weekly growth, dominating Delta and other variants. #GetVaxxed #GetBoosted. No information on severity here.
https://joindiaspora.com/posts/009fcd7044e0013a76c7002590d8e506
Thread: https://threadreaderapp.com/thread/1471651826554470402.html
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Insider reveals trade desires of Trevor Zegras #NHL #NYR #NoQuitInNY https://www.dailyhockeydose.com/nhl-team/new-york-rangers/insider-reveals-trade-desires-of-trevor-zegras?utm_source=dlvr.it&utm_medium=mastodon
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The #NFL #Reaffirms #Support of #Trevor #Project and #LGBTQ #Inclusion.
As part of the continuing #partnership, #TheTrevorProject will provide #educational #training on #LGBTQ #inclusion and #allyship to #NFL #employees.
#Women #Transgender #LGBTQ #LGBTQIA #Entertainment #Sports #Football #Representation #Culture
https://www.metroweekly.com/2023/11/the-nfl-reaffirms-support-of-trevor-project-and-lgbtq-inclusion/
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#DNC2024 While #TheChicks version of our national anthem was awesome, it did remind me of Trevor Noah's hilarious riff on #America and how everyone who sings #TheStarSpangledBanner can just make it up however they want.
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#NFL #ArtButSports #TrevorLawrence
Via β Rodger Sherman 🤖 @rodger
Beautiful 500-year old painting of Trevor Lawrence by Raphael in the Uffizi in Florence
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If you haven’t already, I highly recommended this podcast on Trevor Milton & #Nikola.
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If you haven’t already, I highly recommended this podcast on Trevor Milton & #Nikola.
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If you haven’t already, I highly recommended this podcast on Trevor Milton & #Nikola.
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If you haven’t already, I highly recommended this podcast on Trevor Milton & #Nikola.
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If you haven’t already, I highly recommended this podcast on Trevor Milton & #Nikola.
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To start discussions, a panel moderated by Rachel Hayes, partner with William Fry, and panellists Jean Carberry of Dept of Enterprise, Dale Sunderland of Data Protection Commission, John Evans of Coimisiún na Meán, and Trevor Fitzpatrick of the Central Bank of Ireland.
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To start discussions, a panel moderated by Rachel Hayes, partner with William Fry, and panellists Jean Carberry of Dept of Enterprise, Dale Sunderland of Data Protection Commission, John Evans of Coimisiún na Meán, and Trevor Fitzpatrick of the Central Bank of Ireland.
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To start discussions, a panel moderated by Rachel Hayes, partner with William Fry, and panellists Jean Carberry of Dept of Enterprise, Dale Sunderland of Data Protection Commission, John Evans of Coimisiún na Meán, and Trevor Fitzpatrick of the Central Bank of Ireland.
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To start discussions, a panel moderated by Rachel Hayes, partner with William Fry, and panellists Jean Carberry of Dept of Enterprise, Dale Sunderland of Data Protection Commission, John Evans of Coimisiún na Meán, and Trevor Fitzpatrick of the Central Bank of Ireland.
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To start discussions, a panel moderated by Rachel Hayes, partner with William Fry, and panellists Jean Carberry of Dept of Enterprise, Dale Sunderland of Data Protection Commission, John Evans of Coimisiún na Meán, and Trevor Fitzpatrick of the Central Bank of Ireland.
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#BostonWeekend 9/x Sunday I LIKE GIRLS WHO WEAR ABERCROMBIE AND FITCH at the winery - its LFO for the elder millennials https://www.youtube.com/watch?v=NHuGG_FsC20 https://tickets.citywinery.com/event/lfo-life-is-good-tour-w-trevor-penick-of-o-town-60cssf #WINEMOMS #BostonMusic #Millennials #SummerGirls #LFO #O-TOWN #OTOWN #ElderMillennial
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Bloodletter – Leave the Light Behind Review
By ClarkKent
Hot off Holdeneye’s 3.5 for their third album, Chicago’s Bloodletter jumps right back into more thrashy melodeath with album number four, Leave the Light Behind. Holdeneye saw a big improvement between sophomore record Funeral Hymns and A Different Kind of Hell, saying he finally saw what so enamored Angry Metal Guy about Funeral Hymns.1 I too, grew enamored when I first set my ears on their style of smooth, polished thrash. Bloodletter play my kind of kryptonite—catchy, melodic guitar leads with tons of energy. When I saw this hit the promo bin, I immediately snatched it before Dr. AMG could get his hands on it. I was anxious to discover if Bloodletter could keep up with the energy and expert melodicism of their previous work.
Leave the Light Behind continues in the melothrash vein of its predecessor, combining thunderous, lightning-fast blast beats with memorable harmonic riffs. Bloodletter sounds as if they were born of an orgy between Black Dahlia Murder, Death Angel, Exodus, and At the Gates. If that doesn’t sound like a good time, then you should get your ears checked by one of our staff doctors. Bloodletter has an undeniable polish, giving them a modern sound, though that means they miss out on the charms of the raw energy of Bonded by Blood or Slaughter of the Soul. In some ways, they’ve even upped their thrash game—some of those tremolos are so speedy I can’t help but wonder if they contracted Flash as a special guest. However, it’s not all speed all the time. A few songs slow things down to a mid-tempo while still managing to sound fresh and vivacious (“Terminal,” “Call of the Deep One”). They even have a moment on “Night Terrors” where a haunting piano intro lulls you into expecting a ballad before the sudden booming snare drum knocks you flat. Nonetheless, the album’s breakneck velocity ensures that its 34 minutes are over in the blink of an eye. So you better pay attention.
Between Funeral Hymns and Leave the Light Behind, there’s no denying the quality and growth of these musicians. The muscular drums and frenzied, yet disciplined, riffs keep a breathless pace. Yet drummer Zach Sutton and guitarists Peter Carparelli and Pat Armamentos display some nuance to show that Bloodletter is more than simple speed bag-level velocity. Most impressive are the harmonic guitar leads featured in many choruses. You might not find yourself singing along to the words, but you might instead hum along to the catchy melodic riffage on display during “A World Unmade,” “Terminal,” and “Unearthing Darkness.” For these alone, I feel that Leave the Light Behind is a step up from its predecessor. Even outside of the harmonic leads, the riffs are a blast, and thanks to their variety, they never grow stale or repetitive
One major point of criticism aimed at Bloodletter, both from Holdeneye and readers, is Carparelli’s one-note vocals. Personally, they don’t bother me much. His scratchy shouts bring a punky energy that adds some urgency to the thrash. Yet it’s true that his voice hovers in a state of limbo—he lacks the snarls of Trevor Strnad, nor does he truly sing like Anthrax’s Joey Belladonna. Those put off by him on previous albums won’t find the vocal situation any different this time around. I still find Carparelli effective, especially on “The Black Death,” the rare song where the singing on the chorus is more fun than the riffs. He brings forth a burst of raw, despairing anger as he sings “This is more than sickness / It’s a god damn tragedy.” Carparelli nicely complements the rest of the music, and his personality has begun to bleed into the DNA of Bloodletter, making him an inseparable part of it.
If what you want is a tight, enjoyable piece of melodic thrash, then you can’t do much better than Leave the Light Behind. Bloodletter has undeniably honed their craft into a no-frills, efficient exemplar of the style. And it’s another notch in the belt for Chicago, Illinois, along with Blind Equation, Bear Mace, and the new Pope. Maybe if Chicago sports stadiums played music from these local bands, fans would have something to cheer about. Leave the Light Behind also continues the winning streak for Bloodletter. As far as thrash and melodeath go, this is one of the standouts of 2025.
Rating: 4.0/5.0
DR: 7 | Format Reviewed: WAV
Label: Wise Blood Records
Websites: Bandcamp | Facebook
Releases Worldwide: July 25th, 2025#2025 #40 #AmericanMetal #Anthrax #AtTheGates #BearMace #BlackDahliaMurder #BlindEquation #Bloodletter #DeathAngel #Exodus #Jul25 #LeaveTheLightBehind #MelodicDeathMetal #Review #Reviews #ThrashMetal #WiseBloodRecords
