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Videos de Conceptos Relacionados

Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
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...
Orders of Magnitude01:15

Orders of Magnitude

The order of magnitude of a number is the power of 10 that most closely approximates it. Thus, the order of magnitude estimates the scale (or size) of its value. To find the order of magnitude of a number, take the base-10 logarithm of the number and round it to the nearest integer. Then the order of magnitude of the number is simply the resulting power of 10.
The order of magnitude is simply a way of rounding numbers consistently to the nearest power of 10. This makes doing rough mental math...
Eccentricity of an Ellipse01:27

Eccentricity of an Ellipse

An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
Gravitation Between Spherically Symmetric Masses01:14

Gravitation Between Spherically Symmetric Masses

The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
Gravity between Spherical Bodies01:27

Gravity between Spherical Bodies

Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Bringing the Visible Universe into Focus with Robo-AO
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Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

ASTRONOMÍA: La distancia hasta la Gran Nube de Magallanes.

A A Cole

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

    Determinar la distancia a la Gran Nube de Magallanes (LMC) es crucial para la cosmología. Se espera que las nuevas observaciones de las Cefeidas y las estrellas binarias eclipsantes resuelvan pronto las disputas actuales sobre su distancia precisa.

    Área de la Ciencia:

    • La astronomía y la astrofísica.
    • Cosmología Cosmología.

    Sus antecedentes:

    • La Gran Nube de Magallanes (LMC) es un objeto celeste clave para medir las distancias intergalácticas.
    • Las mediciones precisas de la distancia al LMC son vitales para varios modelos cosmológicos.

    Objetivo del estudio:

    • Para abordar la disputa en curso con respecto a la distancia precisa a la Gran Nube de Magallanes.
    • Para resaltar las implicaciones cosmológicas de resolver la incertidumbre de la distancia LMC.

    Principales métodos:

    • Utilizando observaciones de las estrellas variables Cefeidas para determinar la luminosidad y la distancia.
    • Empleando sistemas de estrellas binarias eclipsantes para la calibración independiente de distancias.

    Principales resultados:

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    • Los métodos actuales para determinar la distancia de la LMC producen resultados contradictorios.
    • Las observaciones de cefeidas y eclipses binarios ofrecen vías prometedoras para la resolución.

    Conclusiones:

    • Resolver la distancia al LMC es un objetivo crítico y alcanzable en el futuro cercano.
    • La distancia exacta del LMC refinará las estimaciones de los parámetros cosmológicos.