Video Experimental Relacionado
Updated: Jul 11, 2026

09:31
Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
Published on: August 31, 2017
Esferas de silicato de sedimentos de aguas profundas: confirmación del origen extraterrestre
Resumen
Se han identificado definitivamente esferas de silicato extraterrestres, comunes en los sedimentos de aguas profundas de la Tierra. Su composición de elementos traza coincide con el material primitivo del sistema solar, confirmando su origen cósmico.
Área de la Ciencia:
- Cosmoquímica es la cosmoquímica.
- Geología Geología Geología.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Las esferas de silicato de la fusión atmosférica de los cuerpos meteorológicos son abundantes materiales extraterrestres en la Tierra.
- A pesar de su prevalencia en los sedimentos de aguas profundas durante más de un siglo, la identificación positiva ha sido un desafío.
- Estudios previos habían señalado un supuesto origen extraterrestre basado en la presencia de sedimentos.
Objetivo del estudio:
- Para identificar definitivamente las esferas de silicato de origen extraterrestre.
- Para confirmar la naturaleza extraterrestre de las esferas de sedimentos de aguas profundas.
- Para analizar la composición de oligoelementos para la confirmación del origen.
Principales métodos:
- Análisis de la abundancia de oligoelementos no volátiles en las esferulas de silicato.
- Comparación de las abundancias elementales con las composiciones conocidas de materiales del sistema solar primitivo.
Principales resultados:
- Una esférula de silicato fue identificada positivamente como extraterrestre.
- Las abundancias de oligoelementos de la esférula identificada coincidían estrechamente con las del material primitivo del sistema solar.
- Esto proporciona evidencia concreta para el origen extraterrestre de tales esferulas.
Conclusiones:
- Las esferas de silicato que se encuentran en los sedimentos de aguas profundas se pueden identificar definitivamente como extraterrestres.
- El análisis de elementos traza es un método fiable para confirmar el origen cósmico de estas partículas.
- Este hallazgo avanza en nuestra comprensión del material extraterrestre en la Tierra.
Videos de Conceptos Relacionados
Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Cell Inclusions
Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid polymers that...
Sulfur Assimilation
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

