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Videos de Conceptos Relacionados

Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Thomson's e/m Experiment01:19

Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
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...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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Conducting Miller-Urey Experiments
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ASTROBIOLOGÍA: La propuesta de Ames para un laboratorio desencadena una batalla en la NASA

A Lawler

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

    El Centro de Investigación Ames de la NASA propone un nuevo edificio para su programa de astrobiología, provocando un debate. Algunos apoyan la iniciativa, mientras que otros se preocupan por los costos y el instituto virtual.

    Área de la Ciencia:

    • Astrobiología Astrobiología.
    • Ciencias espaciales Ciencias espaciales Ciencias espaciales
    • Infraestructura de Investigación Infraestructura de Investigación

    Sus antecedentes:

    • El Centro de Investigación Ames de la NASA está considerando un intercambio de tierras.
    • Se propone un nuevo edificio para el programa de astrobiología.
    • El núcleo del programa es un instituto virtual de dos años en Ames.

    Objetivo del estudio:

    • Para evaluar la propuesta de un nuevo edificio de astrobiología en la NASA Ames.
    • Comprender las ventajas y desventajas potenciales de la instalación propuesta.
    • Para abordar las opiniones contradictorias de los paneles científicos.

    Principales métodos:

    • Análisis de propuestas para el uso del suelo y la nueva construcción.

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  • Revisión de los dictámenes de los paneles consultivos científicos.
  • Tener en cuenta los costos operativos y las prioridades del programa.

    • Principales resultados:

    • Existen opiniones contradictorias con respecto al edificio propuesto.
    • Las preocupaciones planteadas acerca de socavar el modelo de instituto virtual.
    • La posible desviación de fondos de otras prioridades es una preocupación.

    Conclusiones:

    • La propuesta para un nuevo edificio de astrobiología en la NASA Ames está siendo revisada.
    • Continúa el debate sobre la estructura óptima y la financiación para el programa de astrobiología.
    • Se prevé una discusión adicional en una próxima reunión.