Video Experimental Relacionado
Updated: Jun 28, 2026
09:12
A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
Published on: June 28, 2015
Fullerenos en un cráter de impacto en la nave espacial LDEF
F Radicati di Brozolo1, T E Bunch, R H Fleming
1Charles Evans and Associates, Redwood City, California 94063, USA.
Nature
|May 5, 1994
Resumen
Los fullerenos, moléculas como C60 y C70, se detectaron en los desechos espaciales de la nave espacial Long Duration Exposure Facility (LDEF). Este hallazgo proporciona evidencia de los fullerenos en el espacio, que potencialmente se originan en meteoritos o se forman durante impactos.
Área de la Ciencia:
- La astroquímica es astroquímica.
- Ciencia de los materiales Ciencia de los materiales.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- Los fullerenos (C60 y C70) son conocidos en la Tierra y se supone que existen en el espacio.
- Las búsquedas anteriores de fullerenos espaciales, incluso en meteoritos, carecían de evidencia definitiva.
- Los espectros de las nubes interestelares sugieren la presencia de fullereno, pero falta la observación directa.
Objetivo del estudio:
- Para investigar la presencia de fullerenos en el espacio.
- Para analizar los residuos carbonosos de impacto de la nave espacial de la Instalación de Exposición de Larga Duración (LDEF).
- Determinar el origen y la supervivencia de los fullerenos en el entorno espacial.
Principales métodos:
- Espectrometría de masas de ionización láser espectrometría de masas de ionización láser.
- La espectroscopia de Raman es una espectroscopia de Raman.
- Análisis de residuos de impacto de las naves espaciales LDEF.
- Experimentos de impacto de hipervelocidad experimentos de impacto de hipervelocidad.
Principales resultados:
- Los fullerenos fueron detectados en un cráter y expulsados por la nave espacial LDEF.
- Los impactos experimentales mostraron que los fullerenos pueden sobrevivir a las colisiones de hipervelocidad.
- La evidencia sugiere que los fullerenos no eran artefactos instrumentales o contaminantes.
Conclusiones:
- El estudio proporciona la primera evidencia observacional de fullerenos asociados con residuos de impacto espacial.
- Los hallazgos sugieren que los fullerenos pueden llegar a la Tierra a través de meteoritos o formarse en el espacio.
- Esta investigación abre caminos para comprender la formación y distribución de los fullerenos en el cosmos.
Videos de Conceptos Relacionados
01:00Elastic Collisions: Introduction
An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
01:15Elastic Collisions: Case Study
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
01:13Rocket Propulsion in Empty Space - I
The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
01:12Rocket Propulsion In Empty Space - II
The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
01:26Escape Velocity
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
01:23Lumber Defects
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...