Video Experimental Relacionado
Updated: Apr 3, 2026
11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
11.1K
El ciclo diurno del hielo de agua en el cometa 67P/Churyumov-Gerasimenko
M C De Sanctis1, F Capaccioni1, M Ciarniello1
1Istituto di Astrofisica e Planetologia Spaziali - INAF, via del fosso del cavaliere 100, 00133 Rome, Italy.
Nature
|September 25, 2015
Resumen
El cometa 67P/Churyumov-Gerasimenko exhibe hielo de agua superficial que aparece y desaparece cíclicamente con la iluminación solar. Este ciclo del agua influye en la actividad cometaria y la evolución de la superficie.
Área de la Ciencia:
- Ciencias planetarias
- Ciencia de los cometas
- Astrobiología
Sus antecedentes:
- El hielo de agua superficial limitado en los núcleos cometarios desafía las explicaciones de la desgasificación de agua observada.
- La actividad cometaria, como los chorros de polvo en 9P/Tempel 1, muestra una correlación parcial con el hielo expuesto.
- Las variaciones diurnas en la actividad de 67P/Churyumov-Gerasimenko están relacionadas con el cambio de la insolación.
Objetivo del estudio:
- Para investigar la presencia y el comportamiento del hielo de agua superficial en el cometa 67P/Churyumov-Gerasimenko.
- Para entender la relación entre la iluminación solar y el hielo de agua cometario.
- Determinar el papel del hielo de la superficie en la actividad y evolución de los cometas.
Principales métodos:
- Observaciones de la superficie del cometa 67P/Churyumov-Gerasimenko.
- Análisis de las variaciones diurnas en la actividad cometaria.
- Correlación de la presencia de hielo con las condiciones de iluminación locales.
Principales resultados:
- Se realizaron observaciones directas del hielo de agua superficial en el cometa 67P/Churyumov-Gerasimenko.
- El hielo de agua exhibe un patrón cíclico, apareciendo y desapareciendo con la iluminación local.
- Esto proporciona una fuente localizada de actividad, vinculada a la iluminación solar.
Conclusiones:
- Se confirma un ciclo de agua de superficie impulsado por la iluminación solar en el cometa 67P/Churyumov-Gerasimenko.
- Este proceso contribuye a la actividad cometaria localizada.
- El ciclo del agua modifica cíclicamente la abundancia de hielo de agua superficial, impactando la evolución del cometa.
Más Videos Relacionados
13:38Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
Published on: October 26, 2019
8.6K
08:49Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors
Published on: December 21, 2019
10.4K
Videos de Conceptos Relacionados
01:00The Water Cycle
29.5K
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
29.5K
01:23States of Water
58.3K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
58.3K
02:39Phase Transitions: Melting and Freezing
15.7K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.7K
02:33Phase Transitions: Sublimation and Deposition
20.9K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
20.9K
01:03Precipitation Gravimetry
16.1K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
16.1K
01:12Precipitation Processes
6.5K
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
6.5K