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Global Climate Change01:50

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is always directed...
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...

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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

Impacto profundo: observaciones de una campaña mundial basada en la Tierra.

K J Meech1, N Ageorges, M F A'Hearn

  • 1Institute for Astronomy, University of Hawaii at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA.

Science (New York, N.Y.)
|September 10, 2005
PubMed
Resumen

La misión Deep Impact reveló nuevos y distintos materiales expulsados del cometa 9P/Tempel 1 después de la colisión. La actividad del cometa volvió a la normalidad en cuestión de días, mostrando fenómenos transitorios posiblemente relacionados con la formación de cráteres.

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Área de la Ciencia:

  • Ciencias planetarias Ciencias planetarias.
  • Ciencia de los Cometas Ciencia de los Cometas
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • Los cometas proporcionan información sobre el sistema solar temprano.
  • Comprender la composición y la actividad de los cometas es crucial para la ciencia planetaria.

Objetivo del estudio:

  • Para analizar la composición y el comportamiento del cometa 9P/Tempel 1 después de la misión Deep Impact.
  • Para investigar la eyección y los fenómenos transitorios resultantes del impacto.

Principales métodos:

  • Campaña de observación coordinada por los observatorios globales y espaciales.
  • Análisis de los datos recopilados antes, durante y después de la colisión de Deep Impact.

Principales resultados:

  • Descubrimiento de nuevo material eyectado de composición diferente al material previo al impacto.
  • Significativamente mayor proporción de masa de polvo a gas en el eyecto en comparación con los niveles previos al impacto.
  • La actividad cometaria regresó a los niveles basales dentro de los cinco días posteriores al impacto.
  • Observación de fenómenos transitorios potencialmente relacionados con la física de los cráteres.

Conclusiones:

  • La colisión del impacto profundo proporcionó datos únicos sobre la respuesta cometaria al impacto.
  • La composición de las eyecciones cometarias y la dinámica de actividad se alteraron significativamente temporalmente.
  • Los fenómenos transitorios observados pueden ofrecer información sobre los procesos de cráteres de impacto en cuerpos pequeños.