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Detection of Black Holes01:10

Detection of Black Holes

2.2K
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...
2.2K
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

226
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
226
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

524
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
524
X-ray Imaging01:24

X-ray Imaging

5.6K
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
5.6K
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

2.3K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.3K
Errors in Global Positioning System01:26

Errors in Global Positioning System

66
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
66

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Video Experimental Relacionado

Updated: Jul 18, 2025

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

19.5K

El ataque cibernético cierra los principales telescopios.

Celina Zhao, Tanvi Dutta Gupta

    Science (New York, N.Y.)
    |August 24, 2023
    PubMed
    Resumen

    Los astrónomos se enfrentan a desafíos significativos debido a la denegación del acceso remoto, arriesgando la pérdida de tiempo de observación crucial del telescopio. Esto tiene un impacto en la investigación astronómica y los esfuerzos de recopilación de datos a nivel mundial.

    Área de la Ciencia:

    • Astronomía y astrofísica
    • Ciencias de la observación

    Sus antecedentes:

    • El acceso remoto a los observatorios astronómicos es fundamental para la adquisición eficiente de datos.
    • Las recientes restricciones al acceso remoto han creado importantes obstáculos operativos para los investigadores de todo el mundo.

    Objetivo del estudio:

    • Para investigar las consecuencias de negar el acceso remoto para los astrónomos.
    • Para resaltar los desafíos que se enfrentan en la preservación del valioso tiempo de observación.

    Principales métodos:

    • Análisis de los registros de acceso de los observatorios y de los comentarios de los astrónomos.
    • Estudios de caso de proyectos de investigación afectados por restricciones de acceso.

    Principales resultados:

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    • Los astrónomos informaron de dificultades significativas en la realización de investigaciones debido a la falta de acceso remoto.
    • El valioso tiempo de observación estaba en riesgo de perderse, impactando en el progreso científico.

    Conclusiones:

    • Asegurar un acceso remoto consistente y fiable es crucial para la investigación astronómica moderna.
    • Abordar los problemas de acceso es vital para evitar la pérdida de datos de observación irremplazables.