Enceladus Roll

This graphic illustrates the interior of Saturn moon Enceladus. It shows warm, low-density material rising to the surface from within, in its icy shell yellow and/or its rocky core red

More: https://images.nasa.gov/details/PIA08500
Credit: NASA/JPL/Space Science Institute

#enceladus #cassini #cassinihuygens #astrodon #astronomy #astrophotography #astrophysics

A Snowball in Space

Saturn's moon Enceladus, covered in snow and ice, resembles a perfectly packed snowball in this image from NASA's Cassini mission. Cassini has imaged Enceladus many times throughout its mission, discovering a fractured surface and the now-famous geysers that erupt icy particles and water vapor from f...

More: https://images.nasa.gov/details/PIA17182
Credit: NASA/JPL-Caltech/Space Science Institute

#enceladus #cassini #cassinihuygens #astrodon #astronomy #astrophotography #astrophysics

@astropic

Enceladus is essentially the solar system's ultimate mirror. Because those giant geysers constantly spray fresh, ultra-pure water ice all over its surface, it reflects about 99% of the sunlight that hits it. It's like a planet-sized, freshly polished ski resort.

#Enceladus
#albedo

@astropic
6/
It transforms a beautiful but vague snapshot into a highly precise, readable map of a cryovolcano in action!

#astrophotography
#Cassini
#Enceladus
#cryovolcano

@astropic
5/
Preventing Data "Washout"

If Cassini had taken an exposure long enough to make those faint outer plumes visible to a standard camera, the brightly lit crescent of Enceladus itself would have turned into a giant, blown-out blinding white smear, destroying all the data near the surface. False-color processing allows scientists to look at the brightest areas and the dimmest areas at the exact same time without losing details to glare or shadow

#astrophotography
#Cassini
#Enceladus

@astropic
3/
The hot magenta and bright pink zones right at the moon's crescent edge show the absolute highest density—the specific fractures (called "tiger stripes") where the sub-surface ocean is violently venting the most material.

As the colors transition out into red, green, and blue, the material is thinning out and spreading into space.

#astrophotography
#Enceladus

@astropic
2/
1. Mapping Density and Thickness
In the original raw image, the plumes just look like a faint, uniform white haze spraying into the blackness of space. By mapping different levels of light intensity to specific, high-contrast colors, scientists can instantly see the "plumbing" of the plumes.

#astrophotography
#Enceladus

@astropic

This specific, dramatic image from the Cassini spacecraft uses a technique called false-color enhancement (often using an intensity/density map) to solve a major data problem: the extreme difference in brightness between Enceladus itself and its faint icy plumes.

Here is exactly what that vibrant rainbow of color is revealing to planetary scientists:

#astrophotography
#Enceladus

Fountains of Enceladus - Image #2

Recent Cassini images of Saturn's moon Enceladus backlit by the sun show the fountain-like sources of the fine spray of material that towers over the south polar region. The image was taken looking more or less broadside at the "tiger stripe" fractures observed in earlier Enceladus images. It s...

More: https://images.nasa.gov/details/PIA07759
Credit: NASA/JPL/Space Science Institute

#enceladus #cassini #cassinihuygens #astrodon #astronomy #astrophotography #astrophysics

❄️ I když Europa a Enceladus patří mezi nejzajímavější místa Sluneční soustavy – protože pod jejich ledovou krustou se zřejmě ukrývají oceány kapalné vody a možná tak i život – podívat se jim pod kapotu je TUZE SLOŽITÉ! A podle nového českého výzkumu ještě víc, než jsme čekali… 🤔

Zdá se totiž, že úspěšné přistát na takovém světě nemusí být jen otázka přesné navigace, ale i otázka toho, zda se sonda nepropadne do ledové břečky! Vědátoři totiž simulovali podmínky ledových měsíců ve vakuové komoře a sledovali, jak voda mrzne PŘI NÍZKÉM TLAKU a NÍZKÉ GRAVITACI… 🙃

Mno a namísto kompaktní ledová desky, na které můžete klidně stepovat, vznikl poměrně často jen vrstvený, pórovitý a KŘEHKÝ LED připomínající STRUKTURU CROISSANTU. A na ten prostě stabilně sondu o váze stovek kilogramů postavíte jenom obtížně! 🥲

Pro připravovanou automatickou misi Europa Clipper nebo jiné budoucí landery je to zásadní info – pokud kryovulkanismus opravdu vytváří podobné vrstvy, bude nutné znovu promyslet, kde a jak na těchto světech přistávat. Protože poslat sondu přes půl Sluneční soustavy jen proto, aby se hned po dosednutí ZABOŘILA DO LEDOVÉ ŠLEHAČKY, by byl poměrně antiklimatický předčasný finiš vymodlené mise… 😅

#ceskaveda #europa #enceladus #fyzika

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