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Videos de Conceptos Relacionados

Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
The Wave Nature of Light02:12

The Wave Nature of Light

The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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...
Space-Time Curvature and the General Theory of Relativity01:17

Space-Time Curvature and the General Theory of Relativity

In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Video Experimental Relacionado

Updated: May 12, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Luz y sombra de mundos lejanos.

Drake Deming1, Sara Seager

  • 1Planetary Systems Laboratory, Code 693, NASA's Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. Leo.D.Deming@nasa.gov

Nature
|November 20, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los exoplanetas, o planetas fuera de nuestro sistema solar, se descubren cada vez más a través de tránsitos. La investigación futura se centrará en la búsqueda y caracterización de exoplanetas potencialmente habitables, incluidos mundos similares a la Tierra.

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Last Updated: May 12, 2026

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Área de la Ciencia:

  • La astronomía y la astrofísica.
  • Ciencia exoplanetaria Ciencia de los exoplanetas.
  • Astrobiología Astrobiología.

Sus antecedentes:

  • Actualmente se conocen más de 370 exoplanetas (planetas que orbitan estrellas distintas de nuestro Sol).
  • Una parte significativa de los descubrimientos de exoplanetas utilizan el método de tránsito, observando la caída en la luz de las estrellas a medida que un planeta pasa frente a su estrella.
  • El método de tránsito permite la medición de masas y radios de exoplanetas, y la detección de gases atmosféricos para planetas gigantes.

Objetivo del estudio:

  • Describir el estado actual y las perspectivas futuras de la detección y caracterización de exoplanetas.
  • Para resaltar la importancia del método de tránsito en la ciencia exoplanetaria.
  • Proyectar el descubrimiento y estudio de exoplanetas potencialmente habitables en el futuro cercano.

Principales métodos:

  • Fotometría de tránsito: Detección de exoplanetas mediante la observación de la atenuación periódica de la luz de una estrella.
  • Espectroscopia: Análisis de la luz que pasa a través de la atmósfera de un exoplaneta para identificar gases.
  • Astronomía observacional: El uso de telescopios para descubrir y estudiar exoplanetas.

Principales resultados:

  • Decenas de exoplanetas han tenido sus masas y radios determinados utilizando datos de tránsito.
  • Los gases atmosféricos han sido identificados con éxito en varios exoplanetas gigantes.
  • El método de tránsito ha demostrado ser eficaz para el descubrimiento y caracterización de exoplanetas.

Conclusiones:

  • El método de tránsito es una herramienta poderosa para la investigación de exoplanetas.
  • Los avances futuros tienen como objetivo descubrir y estudiar exoplanetas rocosos habitables alrededor de estrellas enanas rojas.
  • El objetivo final incluye obtener imágenes de exoplanetas similares a la Tierra alrededor de estrellas similares al Sol.