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Videos de Conceptos Relacionados

Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Rocket Propulsion in Empty Space - I01:13

Rocket 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...
Rocket Propulsion In Empty Space - II01:12

Rocket 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...
Energy of a Satellite in a Circular Orbit01:11

Energy of a Satellite in a Circular Orbit

Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...

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Video Experimental Relacionado

Updated: Jul 8, 2026

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
13:29

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Published on: August 23, 2012

Viviendo con una estrella: la controversia se enciende sobre el proyecto solar de la NASA.

A Lawler

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    Resumen

    La iniciativa Living With a Star tiene como objetivo estudiar el sol y el clima espacial utilizando satélites. Esta investigación proporcionará información sobre la actividad solar y sus efectos en la Tierra, a pesar de enfrentar controversias.

    Área de la Ciencia:

    • * Física solar y heliofísica.
    • * Investigación del clima espacial.
    • * Ciencias de la Tierra y estudios climáticos.

    Sus antecedentes:

    • * La iniciativa Living With a Star (LWS) es un programa propuesto de 12 años y varios miles de millones de dólares.
    • * El programa implica el lanzamiento de una flota de satélites para observar el sol.
    • * LWS tiene como objetivo mejorar la comprensión de los procesos solares y su impacto en la Tierra.

    Objetivo del estudio:

    • * Investigar la estructura interna y la dinámica del Sol.
    • * Para monitorear y predecir eventos del clima espacial.
    • * Para evaluar los efectos de la actividad solar en el clima de la Tierra y los sistemas de comunicación.

    Principales métodos:

    • * Despliegue de una flotilla de satélites especializados.

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  • * In situ y teledetección de emisiones y partículas solares.
  • * Análisis de datos para modelar el comportamiento solar y el clima espacial.

    • Principales resultados:

    • * Se espera que brinde información crítica sobre el funcionamiento interno del sol.
    • * Proporcionará una visión completa de los fenómenos meteorológicos espaciales.
    • * Los datos ayudarán a comprender las influencias solares en los sistemas terrestres.

    Conclusiones:

    • * La iniciativa LWS promete avances significativos en la investigación solar y del clima espacial.
    • * La comprensión del clima espacial es crucial para mitigar sus efectos en la tecnología y el clima.
    • * El progreso del programa se ve afectado actualmente por controversias burocráticas y relacionadas con la investigación.