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Videos de Conceptos Relacionados

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,...
Kepler's Second Law of Planetary Motion01:29

Kepler's Second 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. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Kepler's Third Law of Planetary Motion01:18

Kepler's Third 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. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
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...
Non-uniform Circular Motion01:22

Non-uniform Circular Motion

In uniform circular motion, the particle executing circular motion has a constant speed, and the circle is at a fixed radius. However, not all circular motion occurs at a constant speed. A particle can travel in a circle and speed up or slow down, showing an acceleration in the direction of motion. In that case, the motion is called non-uniform circular motion, and an additional acceleration is introduced, which is in the direction tangential to the circle. 
For example, such accelerations...
Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...

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Scattering And Absorption of Light in Planetary Regoliths
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Un disco circumestelar alrededor de Beta pictoris.

B A Smith, R J Terrile

    Science (New York, N.Y.)
    |December 21, 1984
    PubMed
    Resumen

    Los astrónomos observaron un gran disco circumestelar alrededor de la estrella beta Pictoris, que se extiende a más de 400 UA. Este disco es este disco.

    Área de la Ciencia:

    • La astronomía y la astrofísica.
    • Ciencias planetarias Ciencias planetarias.

    Sus antecedentes:

    • Un disco circumestelar fue detectado alrededor de la estrella beta Pictoris utilizando observaciones ópticas.
    • La detección inicial del disco se realizó utilizando el satélite de astronomía infrarrojo (IRAS).
    • El disco se extiende significativamente más allá de lo medido anteriormente, alcanzando más de 400 unidades astronómicas (UA).

    Objetivo del estudio:

    • Para caracterizar ópticamente el disco circumestelar alrededor de beta Pictoris.
    • Para comprender las propiedades físicas y la extensión del disco beta Pictoris.
    • Para investigar las implicaciones de la estructura del disco para la formación de planetas.

    Principales métodos:

    • Observación óptica del disco circumestelar alrededor de beta Pictoris.

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  • El análisis del brillo de la superficie cambia con la distancia radial para inferir la densidad de masa.
  • Comparación de las observaciones ópticas con los datos anteriores de infrarrojos del IRAS.

    • Principales resultados:

    • El disco de beta Pictoris se observa casi desde el borde, compuesto de partículas sólidas en órbitas coplanares.
    • La densidad de masa del disco disminuye aproximadamente con la tercera potencia del radio.
    • La estructura aplanada del disco sugiere una asociación con los procesos de formación de planetas.

    Conclusiones:

    • Es probable que el disco circumestelar alrededor de beta Pictoris esté asociado con la formación de planetas en curso o reciente.
    • Se presume que el sistema es relativamente joven, lo que apoya la hipótesis de formación de planetas.
    • La estructura del disco observada proporciona información sobre las primeras etapas del desarrollo del sistema planetario.