Video Experimental Relacionado
Updated: Jul 12, 2026
11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Una ruptura de un asteroide hace 160 millones de años como la probable fuente del impactador K/T
William F Bottke1, David Vokrouhlický, David Nesvorný
1Southwest Research Institute, 1050 Walnut St, Suite 300, Boulder, Colorado 80302, USA. bottke@boulder.swri.edu
Nature
|September 7, 2007
Resumen
La ruptura del asteroide Baptistina hace 160 millones de años probablemente causó un aumento en los impactos de asteroides, incluido el que desencadenó la extinción masiva del Cretácico-Terciario.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- El cráter de impacto es el cráter de impacto.
- Dinámica de los asteroides Dinámica de los asteroides Dinámica de los asteroides Dinámica de los asteroides
Sus antecedentes:
- La tasa de cráteres terrestres y lunares a largo plazo a menudo se supone constante.
- La evidencia sugiere un aumento significativo en el flujo de impacto de cuerpos del tamaño de un kilómetro en los últimos 100 millones de años.
Objetivo del estudio:
- Para investigar la causa del reciente aumento en el flujo de impacto.
- Para determinar el origen del impactador de Chicxulub responsable de la extinción masiva del Cretácico / Terciario.
Principales métodos:
- Análisis de los datos de flujo de impacto.
- Modelado dinámico de fragmentos de asteroides.
- Simulaciones de perturbaciones de asteroides. simulaciones de perturbaciones de asteroides.
Principales resultados:
- La interrupción catastrófica del cuerpo progenitor del asteroide Baptistina (aprox. 170 km de diámetro) hace aproximadamente 160 millones de años.
- Este evento liberó fragmentos en el interior del cinturón principal de asteroides.
- Estos fragmentos fueron entregados lentamente a las órbitas terrestres que cruzan los planetas.
Conclusiones:
- La lluvia de asteroides Baptistina es la fuente más probable (>90%) del impactador de Chicxulub.
- Este evento probablemente desencadenó el evento de extinción masiva del Cretácico / Terciario.
- El estudio desafía el supuesto de una tasa de impacto constante en escalas de tiempo geológicas.
Videos de Conceptos Relacionados
01:30Impact
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
01:26Impact: Problem Solving
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
02:48Radioactive Decay and Radiometric Dating
Radioactivity is a spontaneous disintegration of an unstable nuclide and is a random process, as all the nuclei in the sample do not decay simultaneously. The number of disintegrations per unit time is called the activity (A), which is directly proportional to the number of nuclei in the sample. The decay constant (λ) is an average probability of decay per nucleus in unit time.
01:20Mass Spectrometry: Molecular Fragmentation Overview
The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
00:53Mass Spectrometry: Alkyne Fragmentation
The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a 3-propynyl cation (or propargyl cation). In terminal alkynes, there is the only type of fragmentation that yields the 3-propynyl cation. The unsubstituted 3-propynyl cation exhibits a peak at a mass-to-charge ratio of 39. In internal alkynes, the 3-propynyl cation is substituted. For example, 2-pentyne fragments into methyl-substituted 3-propynyl cation, which...
02:06Conditions 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.