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Videos de Conceptos Relacionados

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...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a change...
Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Tidal Forces01:06

Tidal Forces

The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to black holes.
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
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: Jun 24, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
07:18

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

¿Se está encogiendo el sol?

I I Shapiro

    Science (New York, N.Y.)
    |April 4, 1980
    PubMed
    Resumen
    Este resumen es generado por máquina.

    El análisis de 23 tránsitos de Mercurio desde 1736-1973 no reveló ningún cambio significativo en el diámetro solar. La disminución del diámetro angular basado en la Tierra es inferior a 0,3 segundos de arco por siglo, lo que contradice los hallazgos anteriores.

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    CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

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    Área de la Ciencia:

    • La astronomía es la astronomía.
    • Física solar Física solar es la física de la energía solar.
    • Observaciones históricas Observaciones históricas

    Sus antecedentes:

    • Las mediciones directas del diámetro solar han dado resultados contradictorios.
    • Las observaciones de tránsito histórico ofrecen un método alternativo para evaluar la variabilidad solar.

    Objetivo del estudio:

    • Para investigar los cambios a largo plazo en el diámetro del Sol utilizando datos históricos de tránsito de Mercurio.
    • Para comparar los hallazgos con estudios anteriores basados en observaciones solares directas.

    Principales métodos:

    • Análisis de 23 tránsitos de Mercurio registrados entre 1736 y 1973.
    • Análisis de regresión para determinar la tasa de cambio en el diámetro angular del Sol observado desde la Tierra.

    Principales resultados:

    • No se detectó ningún cambio estadísticamente significativo en el diámetro del Sol.
    • Se calculó una disminución en el diámetro angular de menos de 0,3 segundos de arco por siglo (límite de confianza del 90%).
    • Este resultado contradice el hallazgo de Eddy de una disminución de 2 segundos de arco por siglo.

    Conclusiones:

    • Los datos históricos de tránsito de Mercurio sugieren que el diámetro del Sol se ha mantenido estable durante el período observado.
    • Los hallazgos desafían las afirmaciones anteriores de una contracción significativa del diámetro solar basada en mediciones directas.