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Ultimi arrivi - Venus |
![Nome del file=Z-Venus~1.jpg
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Z-Venus~1.jpgIs there Life on Venus?108 visitePotential signs of life on Venus are fading as astronomers downgrade their original claims.
"The announcement in September 2020 took the World by storm: Researchers using two radio telescopes found signs that the clouds of Venus were harboring phosphine, a toxic compound that on Earth is only made in significant quantities by microbes and chemists. The unexpectedly high levels detected on Venus could point to a floating microbial biosphere, the researchers suggested in a paper published in Nature Astronomy. But almost immediately, other astronomers began to criticize the results, with four independent studies pointing out questionable methods or failing to reproduce the results.
Now, after reanalyzing their data, the original proponents are downgrading their claims. Even the most favorable interpretation of their data now suggests phosphine levels are at least seven times lower than first reported, making it a much more tentative finding, the authors reported in a preprint posted on 17 November to arXiv. But the team still believes the gas is there, with the possibility that local pockets rise to higher levels, said Jane Greaves, an astronomer at Cardiff University who led the work, in a talk today to NASA’s Venus Exploration Analysis Group (VEXAG). “We have again a phosphine line.”
Lets hope more research and study provide the necessary data to prove one way or another!".MareKromiumApr 27, 2022
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![Nome del file=Venus-Volcano-NasaRubin_1600.jpg
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Venus-Volcano-NasaRubin_1600.jpgVenusian "Active" Volcano150 visiteCaption NASA Originale:"What would an erupting volcano on Venus look like? Evidence of currently active volcanoes on Venus was announced earlier this year with the unexplained warmth of regions thought to contain only ancient volcanoes.
Although large scale images of Venus have been taken with radar, thick sulfuric acid clouds would inhibit the taking of optical light vistas. Nevertheless, an artist's reconstruction of a Venusian volcano erupting is featured.
Volcanoes could play an important role in a life cycle on Venus as they could push chemical foods into the cooler upper atmosphere where hungry microbes might float. Pictured, the plume from an erupting volcano billows upwards, while a vast lava field covers part of the hot and cracked surface of Earth's overheated twin. The possibility of airborne microbial Venusians is certainly exciting, but currently controversial".MareKromiumGen 04, 2021
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![Nome del file=Venus_Clouds_-_Akatzuki_960.jpg
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Venus_Clouds_-_Akatzuki_960.jpgVenusian Clouds145 visitenessun commentoMareKromiumOtt 25, 2020
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![Nome del file=Volcanoes-Sapas_Mons-PIA00099-PCF-LXTT-IPF.jpg
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Volcanoes-Sapas_Mons-PIA00099-PCF-LXTT-IPF.jpgThe Eastern Flank of Sapas Mons (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)79 visiteThis NASA - Magellan Spacecraft's image - centered near 9,6° North Latitude and 189,5° East Longitude - covers an area of approx. 140 Km (such as about 86,94 miles) by approx. 110 Km (such as aabout 68,31 miles) and shows us part of the Eastern Flank of the Venusian Volcano known as Sapas Mons, which is located on the Western Edge of Atla Regio.
The bright Lobate Surface Features visible along the Southern and Western portions of the image, oriented in a North/East to South/West directions, are huge Lava Flows. These Flows range, in width, from approx. 5 to 25 Km (such as from about 3,1 to 15,525 miles), with lengths going from about 50 to approx. 100 Km (such as from about 31,05 to 62,1 miles), and they seem to extend themselves way off the area shown here. Additional Radar-Dark (---> Smooth) Flows are also present. The Radar-Bright Linear Structures found in the North/Western portion of the frame are interpreted to be (relatively) shallow Faults and Fractures, which could possibly be associated with the emplacement of Magma in the Sub-Surface.
Furthermore, located near the center of the image, there is an Impact Crater whose diameter is roughly 20 Km (such as about 12,42 miles). This Impact Crater is superimposed on a North/East-to-South/West trending Fracture, while the Southern Side of the Crater's Ejecta Blanket is covered by an approx. 6 Km (such as about 3,72 miles) wide Radar-Bright Lava Flow. These (just apparently) complicated relations indicate that the Crater post-dates an episode of Fracturing and that is older than the Lava Flows covering its Southern Edge.
Last, but not least, this is one of only a few places on Venus where an Impact Crater is seen to be covered by Volcanic Deposits.
This frame (which is an Original NASA - Magellan Spacecraft Radio-Image-Mosaic published on the NASA - Planetary Photojournal with the n. PIA 00099), since it is just a Radio-Image of the Venusian Surface and NOT a real view of it, has been colorized, according to an educated guess carried out by Dr Paolo C. Fienga (LXTT-IPF), in what they could reasonably be its possible Absolute Natural Colors (such as the colors that a human eye would perceive if someone were onboard the NASA - Magellan Spacecraft and, once the thick layer of Venusian Clouds and Fogs is completely overcome, looked down, towards the Surface of Venus itself), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.MareKromiumGen 10, 2014
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![Nome del file=Venus-Mariner_10.jpg
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Venus-Mariner_10.jpgVenus, from Mariner 10 (Natural Colors; credits: NASA/JPL)103 visitenessun commentoMareKromiumApr 28, 2013
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![Nome del file=Craters-Ghost_Crater_in_Lakshmi_Region-PIA00477-PCF-LXTT-IPF.jpg
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Craters-Ghost_Crater_in_Lakshmi_Region-PIA00477-PCF-LXTT-IPF.jpgPossible "Ghost Crater" in Lakshmi Region (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)76 visiteThis NASA - Magellan Spacecraft image covers an area of approximately 100 by 120 Km (such as 62,1 by 74,5 miles) and is located in the Lakshmi Region of Venus, at 47° North Latitude and 334° East Longitude. Due to the extremely dense Venusian Atmosphere, primary Impact Craters of less than a 3 Km (such as 1,863 mileS) diameter are, in fact, nonexistent on the Surface of this Planet. However, the Dark Circular Region and the associated Central Bright Feature visible in this frame are reasonably thought to be the remnants of a Meteoroid that was smaller than the size necessary to create an actual Impact Crater but, anyway, that was big enough to leave some scars on the Venusian Surface.
Entering the Venusian Atmosphere at a low velocity (approximately 350 meters/second - such as about 1260 Km per hour) the Central Bright Feature appears to be a Cluster of Small Secondary Impacts, Ejecta and Debris from the original Meteor that broke up in the Atmosphere and, litterally, fell down in pieces. Even though most of the Meteorite did not hit the Surface, the Atmospheric Shock Wave/s that were generated by the Impact Event, could have been great enough to modify the surrounding Region. One explanation for this radar Dark Circular Formation - called "Dark Margin" -, could be that the Shock Wave/s was/were energetic enough to pulverize some portion of the Venusian Surface (remember that smooth surfaces generally appear radar dark).
Another explanation is that the Surface nere, could be blanketed by a fine material that was formed by the original Meteor's break up through the Atmosphere. Just out of curiosity, more than half of the Impact Craters found on Venus have associated "Dark Margins", and most of them are prominently located left of center of the Craters themselves.
This frame (which is an Original NASA - Magellan Spacecraft Radio-Image published on the NASA - Planetary Photojournal with the n. PIA 00477), since it is just a Radio-Image of the Venusian Surface and NOT a real view of it, has been colorized, according to an educated guess carried out by Dr Paolo C. Fienga (LXTT-IPF), in what they could reasonably be its possible Absolute Natural Colors (such as the colors that a human eye would perceive if someone were onboard the NASA - Magellan Spacecraft and, once the thick layer of Venusian Clouds and Fogs is completely overcome, looked down, towards the Surface of Venus itself), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.MareKromiumMar 22, 2013
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![Nome del file=Craters-Unnamed_Complex_Crater-PIA00462-PCF-LXTT-IPF.jpg
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Craters-Unnamed_Complex_Crater-PIA00462-PCF-LXTT-IPF.jpgUnnamed Complex Crater (Possible Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)81 visiteThe NASA - Magellan Spacecraft imaged this multiple-Floored, highly Irregular Impact Crater at Latitude 16,4° North and Longitude 352,1° East, during its 481st and 482nd orbits around the Planet Venus (on Earth, it was September, 27, 1990). This Impact Crater, about 9,2 Km (such as approx. 5,7 miles) in maximum diameter, was formed on what appears to be a slightly fractured, radar-dark (---> smooth) Venusian Plain. The abundant, low viscosity Flows associated with this Impact Event have, however, filled local Fault-controlled Troughs (---> Graben). These shallow Grabens are well portrayed on this Magellan image but they would have been unrecognizable if they had not (coincidentally) been infillled by the radar-bright Crater Flows.
This fortuitous enhancement by the Crater Flows - of Fault Structures - that were below the resolution capacity of the Magellan Synthetic Aperture Radar provided the Magellan Science Team with valuable Geologic information. For instance, the Flow Deposits from this Impact Crater are now thought to consist - primarily - of "Shock Melted Rock" (---> such as a remarkable quantity of almost liquid rocky material that got pushed away and outwards by the powerful shock-wave/s that followed the original Impact Event/s) and Fragmented Debris resulting from the nearly simultaneous impacts of 2 (two) projectile fragments into the hot (---> approx. 426° Celsius - or about 800 degrees Farheneit) Surface Rocks of Venus. On the other hand, the presence of various Floors in this highly Irregular Impact Crater is interpreted to be the result of Crushing, Fragmentation, and eventual Aerodynamic Dispersion of a single entry projectile (---> meteor) during its passage through the dense Venusian Atmosphere.
This frame (which is an Original NASA - Magellan Spacecraft Radio-Image published on the NASA - Planetary Photojournal with the n. PIA 00462), since it is just a Radio-Image of the Venusian Surface and NOT a real view of it, has been colorized, according to an educated guess carried out by Dr Paolo C. Fienga (LXTT-IPF), in what they could reasonably be its possible Absolute Natural Colors (such as the colors that a human eye would perceive if someone were onboard the NASA - Magellan Spacecraft and, once the thick layer of Venusian Clouds and Fogs is completely overcome, looked down, towards the Surface of Venus itself), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.MareKromiumMar 22, 2013
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![Nome del file=Venus-PIA10124-PCF-LXTT-IPF.jpg
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Aggiunta il=Nov 24, 2012 Venus-PIA10124-PCF-LXTT-IPF.jpg](albums/userpics/10060/small_Venus-PIA10124-PCF-LXTT-IPF.jpg)
Venus-PIA10124-PCF-LXTT-IPF.jpgApproaching Venus (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)78 visiteCaption NASA:"The Planet Venus is enshrouded by a Global Layer of Clouds that obscures its surface to the MESSENGER Dual Imaging System (MDIS) cameras. This single frame is part of a color sequence taken to help the MESSENGER team calibrate the camera in preparation for the spacecraft's first flyby of Mercury on January 14, 2008. Over the next several months the camera team will pore over the 614 images taken during this Venus encounter to ascertain color sensitivity and other optical properties of the instrument. These tasks address two key goals for the camera at Mercury: understanding surface color variations and their relation to compositional variations in the Crust, and ensuring accurate cartographic placement of features on Mercury's Surface.
Preliminary analysis of the Venus Fly-By images indicates that the cameras are healthy and will be ready for next January's close encounter with Mercury".
Nota Lunexit: questo NASA - MESSENGER color-frame è stato prima riportato sulla Scala dei Grigi, poi ingrandito, riprocessato e poi ricolorizzato in Colori Naturali Assoluti. Il risultato è un pò bizzarro, probabilmente poco realistico, ma sen'altro suggestivo. Giudicate Voi!MareKromiumNov 24, 2012
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![Nome del file=Venusian_Surface-Venera_13-07-DPM.jpg
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Venusian_Surface-Venera_13-07-DPM.jpgTerra Incognita (Additional Credits: Don P. Mitchell - perspective visualization)190 visiteFrame Sx ---> Venera 13; Frame Dx ---> Venera 14MareKromiumApr 28, 2012
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![Nome del file=Venusian_Surface-Venera_13-06-DPM-PCF-LXTT-IPF-1.jpg
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Venusian_Surface-Venera_13-06-DPM-PCF-LXTT-IPF-1.jpgTerra Incognita (Additional Credits: Don P. Mitchell - perspective visualization - and Dr Paolo C. Fienga - Colorization)162 visiteFollowing yesterday's APOD, we have decided to take you once again on the Surface of the Planet Venus (as imaged by the Soviet Lander Venera 13) and we are proud to show you the result of a combined effort: the perspective imaging of the Venusian Surface as seen from the the Lander (a work carried out by the American Researcher Dr Don P. Mitchell) with the Absolute Natural Colorization of the landscape and Sky (this job carried out by the Italian Researcher Dr Paolo C. Fienga). The result, as you can see, is a deeply suggestive (and, maybe, even a little scary...) vision of what has been called by many Scientists and Researchers, "The Venusian Inferno": such as a World that, from every point of view, seems to be completely hostile to the human concept of Life itself.
And here is a brief story of what happened that day, such as March 1st, 1982, when the Descent Module of the Venera 13 Spacecraft landed on Venus, as told us by Dr Don P. Mitchell himself:"...Two optical-mechanical cameras repeatedly scanned 180° or 60° through Clear and Colored Filters and at higher resolution than the Venera 9/10 System. The camera system was developed by Dr A.S. Selivanov's Team at the Institute of Space Device Engineering. The main Spacecraft, flying on a Fly-By Trajectory, remained in radio contact with the Lander for 127 minutes. It relayed the video to Earth as a phase-modulated digital signal, at 9 bits per pixel. The Venera 13 (and Venera 14 too) Lander/s transmitted digital images with a depth of 9 bits and an approximately logarithmic encoding of photometric brightness. Multiple panoramas were scanned by the camera, including some with red, green or blue glass filters in place. The entire transmission was relayed to Earth in real time, and also replayed from digtal tape recordings onboard the Venera 13 Spacecraft. This peculiar tecnique permitted the reconstruction of an almost noiseless version from the multiple transmissions. An accurate conversion of that encoding to linear brightness has also been derived, using calibration information included with the images (to be noted is the improved rendering of shape and details in very dark and very light portions of the image). The original Soviet versions of this frame included a full panorama from Clear-Filter images, and color panoramas from the red, green and blue-filter images. The signal to noise was poorer for the color images, because they were much darker. I (meaning Dr Don P. Mitchell) combined the two types of panoramas by adding the Chroma Signal (in CIE Lab Color Space) from the color images with the luminance from the clear images, thus obtaining simply spectacular results. Furthermore, the Venera 13 panoramas were just spherical projections and therefore they had to be remapped to perspective projections and overlayed (using Adobe Photoshop CS2) to produce views that were good enough to give us a better subjective impression of the Venusian Surface. In the overhead view, notice the subtle shadowing existing around the Lander. The Surface illumination is from the uniformly bright hemisphere of the Sky, but the Lander (as you can better see in the spherical projections) blocks part of the Sky from nearby Ground. In addition to the above, please notice that in this frame the thick yellow-orange color of the Sky is due to Rayleigh Scattering of the Sunlight by the thick Venusian Atmosphere and, possibly, by an additional (still) unknown blue-absorbing Gas Component. Brightness has been normalized. Please remember that the variations in the color of the Surface and Sky that you may certainly notice once you will have compared different color images taken by the different Soviet Venera Class Landers that made it to the Venusian Surface, are due to differing Atmospheric Depths and Opacities, as well as to the differing Sun Angles existing at the different Landing Sites...".
MareKromiumApr 28, 2012
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![Nome del file=Venus-Southern_Vortex-ESA-VE.jpg
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Venus-Southern_Vortex-ESA-VE.jpgVenus' South Polar Vortex115 visiteCaption NASA:"What's happening over the South Pole of Venus?
To find out, scientists have been studying images taken by the robotic Venus Express spacecraft when it passes over the lower spin axis of Earth's overheated twin. Surprisingly, recent images from Venus Express do not confirm previous sightings of a double storm system there, but rather found a single unusual swirling cloud vortex.
In the above recently released image sequence taken in IR Light and digitally compressed, darker areas correspond to higher temperatures and hence lower regions of Venus' Atmosphere. Also illuminating are recently released movies, which show similarities between Venus' Southern Vortex and the Vortex that swirls over the South Pole of Saturn. Understanding the peculiar dynamics of why, at times, two Eddies (Eddy - plur. Eddies ---> vortice/i, mulinello/i) appear, while at other times a single peculiar Eddy appears, may give insight into how hurricanes evolve on Earth, and remain a topic of research for some time. In three months, the European Venus Express spacecraft will be joined around Venus by the Japanese Akatsuki satellite".MareKromiumOtt 01, 2010
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![Nome del file=Volcanoes-Idunn_Mons-PIA13001-2.jpg
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Aggiunta il=Apr 09, 2010 Volcanoes-Idunn_Mons-PIA13001-2.jpg](albums/userpics/10060/small_Volcanoes-Idunn_Mons-PIA13001-2.jpg)
Volcanoes-Idunn_Mons-PIA13001-2.jpgIdunn Mons (Perspective View and False Colors; credits: NASA/JPL-Caltech/ESA)54 visiteCaption NASA:"This figure shows the Volcanic Peak Idunn Mons (at about 46° South Lat. and 214,5° East Long.) in the Imdr Regio area of Venus. The topographic backbone derives from data obtained by NASA's Magellan spacecraft, with a vertical exaggeration of 30 times.
Radar data (in brown) from Magellan has been draped on top of the topographic data. Bright areas are rough or have steep slopes. Dark areas are smooth.
The warmest area of Idunn is centered on the Summit, which stands about 2,5 Km (approx. 1,6 miles) above the Datum, and the bright Lava Flows that originate there. Idunn Mons has a diameter of about 200 Km (approx. 120 miles).
The spectrometer data was collected from May 2006 to the end of 2007. A movie featuring 360-degree views of the volcano is based on the same data and can be viewed at JPL's Multimedia".MareKromiumApr 09, 2010
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