"Кассини" !

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tnt22

https://saturn.jpl.nasa.gov/mission/grand-finale/grand-finale-orbit-guide/#Orbit_19
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IN PROGRESS: Orbit 289 - August 17 - August 23

[TH]Event[/TH][TH]Date[/TH][TH]Spacecraft Time (UTC)[/TH][TH]Local Time (PDT)[/TH][TH]Notes[/TH][TH]Apoapse[/TH][TH]Periapse[/TH][TH]Downlink[/TH]
Aug 179:53 a.m.2:53 a.m.
Aug 203:23 p.m.8:23 a.m.Second of the "Final Five" dips into Saturn's atmosphere.
Aug 213:10 a.m.8:10 p.m. (Aug 20)Estimated Earth Received Time (ERT) is 9:30 p.m. PDT on August 20.


tnt22

Цитировать Jonathan McDowell‏Подлинная учетная запись @planet4589 2 ч. назад

Cassini passed apoapsis number 289 around Saturn at about 1000 UTC; now falling into to periapsis-289 at 1530 UTC Aug 20

tnt22

Цитировать CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 9 ч. назад

Ever wondered if events like #Eclipse2017 happen on other planets? They definitely do in the Saturn system! https://go.nasa.gov/2wnYzDo 
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tnt22

https://saturn.jpl.nasa.gov/resources/7729/
ЦитироватьSaturn-lit Tethys



Photojournal: PIA21342

August 21, 2017

Cassini gazes across the icy rings of Saturn toward the icy moon Tethys, whose night side is illuminated by Saturnshine, or sunlight reflected by the planet.

Tethys was on the far side of Saturn with respect to Cassini here; an observer looking upward from the moon's surface toward Cassini would see Saturn's illuminated disk filling the sky.
Спойлер
Tethys was brightened by a factor of two in this image to increase its visibility. A sliver of the moon's sunlit northern hemisphere is seen at top. A bright wedge of Saturn's sunlit side is seen at lower left.

This view looks toward the sunlit side of the rings from about 10 degrees above the ring plane. The image was taken in visible light with the Cassini spacecraft wide-angle camera on May 13, 2017.

The view was acquired at a distance of approximately 750,000 miles (1.2 million kilometers) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 140 degrees. Image scale is 43 miles (70 kilometers) per pixel on Saturn. The distance to Tethys was about 930,000 miles (1.5 million kilometers). The image scale on Tethys is about 56 miles (90 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit https://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini . The Cassini imaging team homepage is at http://ciclops.org .

Credit

NASA/JPL-Caltech/Space Science Institute

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tnt22

#2244
https://saturn.jpl.nasa.gov/news/3088/nine-ways-cassini-matters-no-5/
ЦитироватьAugust 21, 2017

Nine Ways Cassini Matters:
No. 5

Saturn's moon Iapetus. Saturn and Jupiter are unrivaled in our solar system for the sheer number of moons captured in their orbits.
Cassini revealed Saturn's moons to be unique worlds with their own stories to tell.

Planet-size Titan and diminutive Enceladus stood out in Cassini's in-depth survey of Saturn's moons. But the mission showed that every moon in the Saturn system is a unique character with its own mysteries, and many of Saturn's satellites are related in surprising ways.
Спойлер
For example, Cassini data enabled scientists to confirm earlier suspicions that Phoebe is likely an object from the outer solar system beyond Neptune, captured by Saturn's gravity long ago. Phoebe also turns out to be key to the two-toned appearance of the moon Iapetus: As Phoebe sheds its dark dust, it coats the leading side of Iapetus and causes ice to heat up and migrate to the moon's opposite side.

Cassini also gave scientists a better understanding of why Hyperion looks like a giant sponge or wasp's nest tumbling through space. Researchers determined that the moon's density is so low that impacts tend to compress its surface rather than blasting it out, and the material that is launched into space tends to escape for good, thanks to Hyperion's low gravity.


This false-color view of Saturn's moon Hyperion reveals crisp details across the strange, tumbling moon's surface.

Cassini found that Enceladus is not only active, but that its geologic activity is creating Saturn's E ring and spray-painting the surfaces of several of the other moons with its highly reflective ice particles.

The mission also followed up on a mystery from the early 1980s when NASA's Voyager spacecraft flew by the Saturn system and saw bright wispy terrains on Dione. Cassini found that the features were in fact a vast network of canyons. Cassini also detected hints of a faint atmosphere that might have been outgassed from the moon's interior.

And Cassini watched closely over many years how Prometheus interacts with Saturn's F ring to create features like "streamers," "plumes" and "drapes."
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tnt22

Цитировать CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 24 мин. назад
 
We've begun #GrandFinale orbit #20, which will include the deepest dip into Saturn's atmosphere before mission end: https://go.nasa.gov/2qcf2Vx 
https://saturn.jpl.nasa.gov/mission/grand-finale/grand-finale-orbit-guide/#Orbit_20
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IN PROGRESS - August 23 - August 30
[TH]Event[/TH][TH]Date[/TH][TH]Spacecraft Time (UTC)[/TH][TH]Local Time (PDT)[/TH][TH]Notes[/TH]
ApoapseAug 238:51 p.m.1:51 p.m.
PeriapseAug 272:20 a.m.7:20 p.m. (Aug 26)Third and lowest of the "Final Five" dips into Saturn's atmosphere.
DownlinkAug 271:54 p.m.6:54 a.m.Estimated Earth Received Time (ERT) is 8:14 a.m. PDT on August 27.
    [/li]
  • Cassini has just three orbits of Saturn remaining before the mission ends.
  • During this orbit Cassini's Composite Infrared Spectrometer (CIRS) maps Saturn's northern hemisphere to study temperatures in the upper troposphere and the Visible and Infrared Mapping Spectrometer (VIMS) creates a map of Saturn's equatorial region. The CIRS instrument also performs its final Saturn limb observation of the mission.
  • The spacecraft uses its RADAR instrument in active mode to study Saturn's atmosphere.
  • This is the third of five orbits in which Cassini's elliptical orbit carries it so low that the spacecraft passes briefly through Saturn's atmosphere. Cassini's reaction control thrusters are at the ready to correct the spacecraft's orientation in case Saturn's atmosphere pushes on the spacecraft hard enough to cause any rotation. This is the deepest Cassini dips into Saturn's atmosphere during the "Final Five" orbits.
  • During the period in which the spacecraft is nearest Saturn, Cassini's Ion and Neutral Mass Spectrometer (INMS) performs its second session directly sampling Saturn's upper atmosphere. The instrument measures densities of different species of molecular hydrogen, helium and a variety of ions in the immediate vicinity of the spacecraft.

tnt22

https://saturn.jpl.nasa.gov/news/3104/nasa-announces-cassini-end-of-mission-activities/
ЦитироватьAugust 24, 2017
NASA Announces Cassini End-of-Mission Activities


NASA's Cassini spacecraft is shown during its Sept. 15, 2017, plunge into Saturn's atmosphere in this artist's depiction. Cassini will use its thrusters to keep its antenna pointed at Earth for as long as possible while sending back unique data about Saturn's atmosphere. Credit: NASA/JPL-Caltech
 
On Sept. 15, NASA's Cassini spacecraft will complete its remarkable story of exploration with an intentional plunge into Saturn's atmosphere, ending its mission after nearly 20 years in space. News briefings, photo opportunities and other media events will be held at NASA's Jet Propulsion Laboratory in Pasadena, California, and will air live on NASA Television and the agency's website.

NASA also will hold a media teleconference Tuesday, Aug. 29 to preview activities for Cassini during its final two weeks.
Спойлер
Launched in 1997, Cassini arrived in orbit around Saturn in 2004 on a mission to study the giant planet, its rings, moons and magnetosphere. In April of this year, Cassini began the final phase of its mission, called its Grand Finale -- a daring series of 22 weekly dives between the planet and its rings. On Sept. 15, Cassini will plunge into Saturn, sending new and unique science about the planet's upper atmosphere to the very end. After losing contact with Earth, the spacecraft will burn up like a meteor. This is the first time a spacecraft has explored this unique region of Saturn -- a dramatic conclusion to a mission that has revealed so much about the ringed planet.

Cassini flight controllers will monitor the spacecraft's final transmissions from JPL Mission Control.

Cassini Media Events and Schedule

(All media teleconferences and NASA TV news conferences will be available on the agency's website, and times are subject to change)

Tuesday, Aug. 29
    [/li]
  • 2 p.m. EDT -- Media teleconference about spacecraft science and operations activities for the final orbits leading up to the end of the mission will include:
    [/li]
  • Curt Niebur, Cassini program scientist, Headquarters, Washington
  • Earl Maize, Cassini project manager, JPL
  • Linda Spilker, Cassini project scientist, JPL
Visuals discussed during the telecon will be available at the start of the event at:
https://www.nasa.gov/cassinitelecon

Wednesday, Sept. 13
    [/li]
  • 1 p.m. EDT -- News conference from JPL with a detailed preview of final mission activities (also available on NASA TV and online)
Thursday, Sept. 14
    [/li]
  • 10 a.m. to 3 p.m PDT -- NASA Social -- onsite gathering for 30 pre-selected social media followers. Events will include a tour, and a speaker program that will be carried on NASA TV and online.
    [/li]
  • About 8 p.m. PDT -- Final downlink of images expected to begin (streamed online only)

Friday, Sept. 15: End of Mission
    [/li]
  • 7 to 8:30 a.m. EDT -- Live commentary on NASA TV and online. In addition, an uninterrupted, clean feed of cameras from JPL Mission Control, with mission audio only, will be available during the commentary on the NASA TV Media Channel and on Ustream.
    [/li]
  • About 8 a.m. EDT -- Expected time of last signal and science data from Cassini
    [/li]
  • 9:30 a.m. EDT -- Post-mission news conference at JPL (on NASA TV and online)
Media and the public also may ask questions during the events using #askNASA.

For online streaming, visit:

https://www.nasa.gov/live

To watch the news conferences online, visit:
https://www.nasa.gov/live

http://www.youtube.com/nasajpl/live

Accreditation

To cover these events at JPL, media must have pre-arranged credentials issued via the JPL Media Relations Office. The deadlines to apply for credentials have passed.

Resources

A Cassini press kit will be available beginning on Aug. 29 at:

https://saturn.jpl.nasa.gov/mission/grand-finale/for-media

Video for the Cassini mission is available for download at:

https://vimeo.com/album/4649677

The Cassini-Huygens mission is a cooperative project of NASA, ESA (European Space Agency) and the Italian Space Agency. JPL manages the mission for NASA's Science Mission Directorate. JPL designed, developed and assembled the Cassini orbiter.

For more information on the Cassini mission's finale, including graphics, fact sheets, press kit, and an up-to-date timeline of mission events, visit:

https://saturn.jpl.nasa.gov/grandfinale

Follow the mission on social media at:

http://www.twitter.com/CassiniSaturn

https://www.facebook.com/NASACassini

Dwayne Brown / Laurie Cantillo
 NASA Headquarters, Washington       
 |202-358-1726 / 202-358-1077
 dwayne.c.brown@nasa.gov / laura.l.cantillo@nasa.gov

Preston Dyches
 Jet Propulsion Laboratory, Pasadena, Calif.
 818-354-7013
 preston.dyches@jpl.nasa.gov
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tnt22

https://saturn.jpl.nasa.gov/news/3105/cassini-the-wonder-of-saturn/
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August 24, 2017

Cassini: The Wonder of Saturn

https://saturn.jpl.nasa.gov/system/downloadable_items/1016_JPL-20170824-CASSINf-0001-1080cc.m4v
For 13 years the spacecraft's incredible, truly otherworldly images have revealed the wonder of Saturn in surprising, often awe-inspiring ways.

NASA's Cassini spacecraft has explored the Saturn system since 2004, re-writing our understanding of the giant planet, its rings, moons and magnetosphere. For 13 years the spacecraft's incredible, truly otherworldly images have revealed the wonder of Saturn in surprising, often awe-inspiring ways. Cassini is planetary exploration at its finest, proving that to truly reveal the grandeur of a world, there is no substitute for actually going there.

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tnt22

Цитировать CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 2 ч. назад

Inside-out: Saturn's rings as seen fr om inside the gap between the rings and the planet. Details: https://go.nasa.gov/2wdUteQ  #SaturnSaturday
https://video.twimg.com/tweet_video/DIKvdD7VwAA2dRA.mp4
https://saturn.jpl.nasa.gov/resources/7751/
ЦитироватьCassini's 'Inside-Out' Rings Movie



Photojournal: PIA21886

August 25, 2017

This movie sequence of images from NASA's Cassini spacecraft offers a unique perspective on Saturn's ring system. Cassini captured the images from within the gap between the planet and its rings, looking outward as the spacecraft made one of its final dives through the gap as part of the mission's Grand Finale.

Using its wide-angle camera, Cassini took the 21 images in the sequence over a span of about four minutes during its dive through the gap on Aug. 20, 2017. The images have an original size of 512 x 512 pixels; the smaller image size allowed for more images to be taken over the short span of time.
Спойлер
The entirety of the main rings can be seen here, but due to the low viewing angle, the rings appear extremely foreshortened. The perspective shifts from the sunlit side of the rings to the unlit side, wh ere sunlight filters through. On the sunlit side, the grayish C ring looks larger in the foreground because it is closer; beyond it is the bright B ring and slightly less-bright A ring, with the Cassini Division between them. The F ring is also fairly easy to make out.

For a labeled view of Saturn's rings, see "Expanse of Ice."

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of Caltech in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit https://saturn.jpl.nasa.gov and https://www.nasa.gov/cassini. The Cassini imaging team homepage is at https://ciclops.org.

Credit

NASA/JPL-Caltech/Space Science Institute

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tnt22

Цитировать CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 1 ч назад

Ring crossing #20 of our #GrandFinale has been completed successfully. Just two remain. Ride along at: http://saturn.jpl.nasa.gov 

tnt22

https://saturn.jpl.nasa.gov/resources/7750/
ЦитироватьTop of the World



Photojournal: PIA21343

August 28, 2017

These turbulent clouds are on top of the world at Saturn. NASA's Cassini spacecraft captured this view of Saturn's north pole on April 26, 2017 -- the day it began its Grand Finale -- as it approached the planet for its first daring dive through the gap between the planet and its rings.
Спойлер
Although the pole is still bathed in sunlight at present, northern summer solstice on Saturn occurred on May 24, 2017, bringing the maximum solar illumination to the north polar region. Now the Sun begins its slow descent in the northern sky, which eventually will plunge the north pole into Earth-years of darkness. Cassini's long mission at Saturn enabled the spacecraft to see the Sun rise over the north, revealing that region in great detail for the first time.

This view looks toward the sunlit side of the rings from about 44 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 752 nanometers.

The view was obtained at a distance of approximately 166,000 miles (267,000 kilometers) from Saturn. Image scale is about 10 miles (16 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit
https://saturn.jpl.nasa.gov and http://www.nasa.gov/cassini . The Cassini imaging team homepage is at http://ciclops.org.

Credit

NASA/JPL-Caltech/Space Science Institute

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https://spaceflightnow.com/2017/08/28/nasa-releases-inside-out-view-of-saturns-rings/
ЦитироватьNASA releases inside-out view of Saturn's rings
August 28, 2017 Stephen Clark

Continuing to make discoveries in the final weeks of a historic mission at Saturn, NASA's Cassini spacecraft has recorded a unique time lapse movie looking out toward the planet's iconic icy rings.

Cassini captured imagery to assemble the movie during an Aug. 20 swing through the gap between Saturn and its rings. Ground controllers set Cassini's wide-angle camera to take images in a low-resolution mode — 512 x 512 pixels — to allow the spacecraft to gather more photos in a short span of time, according to NASA.
Спойлер

Credit: NASA/JPL-Caltech/Space Science Institute

"The entirety of the main rings can be seen here, but due to the low viewing angle, the rings appear extremely foreshortened," NASA said in a statement. "The perspective shifts fr om the sunlit side of the rings to the unlit side, wh ere sunlight filters through."

The sequence shows Cassini crossing the relatively thin ring plane as it zipped by Saturn at a speed of some 76,000 mph (122,000 kilometers per hour).

"On the sunlit side, the grayish C ring looks larger in the foreground because it is closer; beyond it is the bright B ring and slightly less-bright A ring, with the Cassini Division between them," NASA said. "The F ring is also fairly easy to make out."

Running low on fuel, Cassini is set to end its nearly 20-year mission Sept. 15 with a guided plunge into Saturn's atmosphere. The probe will disintegrate as it descends into the deeper layers of the atmosphere, succumbing to increasing aerodynamic pressures.

Composed mostly of blocks and particles of ice, Saturn's rings are one of the major targets for Cassini's scientific instruments during the mission's final months. Scientists hope to learn the mass of the rings, a figure that should yield an estimate of their age and origin.

Saturn itself is also a focus during Cassini's grand finale.

Measurements of Saturn's gravity and magnetic fields could help scientists study the planet's interior structure, and Cassini's final five passes near the planet are taking the spacecraft into the outermost reaches of the atmosphere, allowing its instruments to take direct samples.

Cassini will beam back atmospheric data in real-time during its final descent into Saturn next month until the probe's control thrusters are unable to keep the craft's antenna locked on Earth.

Launched from Cape Canaveral in October 1997, the spacecraft spent much of its time at Saturn making observations of the planet's numerous moons. Cassini dropped a European Space Agency lander to Titan's surface for a parachute-assisted landing in 2005, and found evidence that Enceladus harbors a global ocean of water buried beneath a veneer of ice.

NASA officials want to end the mission in a guided manner while the spacecraft is still healthy to avoid the chance an uncontrolled Cassini could crash into Titan or Enceladus, potentially spoiling habitats that might be prime for finding alien microbial life.

Since April, Cassini has made repeated passes between Saturn and its rings. Two more flybys are planned before the final dive Sept. 15.
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tnt22

https://saturn.jpl.nasa.gov/news/3107/neptune-from-saturn/
ЦитироватьAugust 25, 2017

Neptune from Saturn

On Aug. 25, 1989, NASA's Voyager 2 made its historic flyby of Neptune and that planet's largest moon Triton. The Cassini mission is publishing this image to celebrate the anniversary of that event.

Neptune appears in this natural color composite (Figure A) as a pale blue disk (similar to Cassini's image of Uranus from 2014, see PIA17178), just below and to the right of image center. Most of the faint specks in the image are background stars, although some are likely cosmic rays (charged particles that strike the camera detector).
Спойлер

Neptune appears in this natural color composite (Figure A) as a pale blue disk, just below and to the right of image center. Image Credit: NASA/JPL-Caltech/Space Science Institute

A cropped and magnified version (Figure B) is provided in monochrome with Triton visible as a point of light above and to the left of Neptune.


A cropped and magnified version (Figure B) is provided in monochrome with Triton visible as a point of light above and to the left of Neptune. Image Credit: NASA/JPL-Caltech/Space Science Institute

In imaging Neptune, Cassini's solar system family portrait-taking is complete. The mission's planetary photojournal includes all of the major planets except Mercury, which is too close to the Sun to be imaged, as well as dwarf planet Pluto.

This view was acquired by the Cassini narrow-angle camera on Aug. 10, 2017, at a distance of approximately 2.72 billion miles (4.38 billion kilometers) from Neptune. Red, blue and green filter images were combined to create the natural color image (Figure A).

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of Caltech in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.

For more information about the Cassini-Huygens mission visit https://saturn.jpl.nasa.gov and https://www.nasa.gov/cassini. The Cassini imaging team homepage is at https://ciclops.org.
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tnt22

https://saturn.jpl.nasa.gov/news/3087/nine-ways-cassini-matters-no-4/
ЦитироватьNine Ways Cassini Matters: No. 4

August 28, 2017

The length of Cassini's mission has enabled us to observe weather and seasonal changes, improving our understanding of similar processes at Earth, and potentially those at planets around other stars.

While other missions flew past Saturn or trained telescopes periodically from afar, Cassini has had a front-row seat for approximately 13 years—nearly half a Saturn year (northern winter to the start of northern summer)—to epic changes unfolding before its very eyes.
Спойлер

The huge storm churning through the atmosphere in Saturn's northern hemisphere overtakes itself as it encircles the planet in this true-color view from NASA's Cassini spacecraft taken in 2011. Image credit: NASA/JPL-Caltech/SSI › Full image and caption

This long-lived robotic observing platform, bristling with science instruments, provided an unparalleled glimpse into what happens as weather and climate conditions on the planet and Titan respond to the seasons—sometimes rather abruptly. Among the most amazing changes Cassini captured: the eruption of a once-every-30-years storm (one of the most powerful ever seen in the solar system), methane rainstorms at Titan and the appearance and disappearance of features such as the "magic island."


Saturn's northern hemisphere is a serene blue, more befitting of Uranus or Neptune, as seen in this natural color image from Cassini taken in 2005.

Over a longer span of years, the color of Saturn's northern hemisphere shifted as the ring shadows retreated southward—changing from the surprisingly bluish tones seen upon arrival to the hazy, golden hues most observers are familiar with. On Titan, Cassini witnessed a vortex filled with complex organic chemicals forming over its south pole, and saw sunlight glinting off of the lakes in its northern hemisphere as the sun rose over them.

The spacecraft's patient eyes also were rewarded with new views of Saturn's north pole as winter ended there and the sun rose once more. Cassini's infrared sensors measured temperatures across the rings as the sun set on one side and rose on the other, revealing new details about the structure of ring particles. It used the onset of wintry darkness at the south pole of Enceladus to obtain an unambiguous reading of the amount of heat coming out of the moon's interior. And it saw the mysterious ring features called spokes (wedge-shaped features in the rings that rotate along with the rings like the spokes in a wheel) appear and disappear—apparently a seasonal phenomenon.
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tnt22

АНОНС

Цитировать CassiniSaturn‏Подлинная учетная запись @CassiniSaturn 27 мин. назад

Join us Aug. 29 at 2 p.m. ET to learn about science & operations during final #GrandFinale orbits https://go.nasa.gov/2wKamfr  #AskNASA for ?s

tnt22

Цитировать Jeff Foust‏ @jeff_foust 3 мин. назад

What the final days of Cassini will look like:

tnt22


tnt22

Цитировать Jeff Foust‏ @jeff_foust 4 мин. назад

Linda Spilker, Cassini project scientist: final images will be a look around Saturn system, like a final look before you move out of a home.

tnt22

Цитировать Jeff Foust‏ @jeff_foust 4 сек. назад

I hope Cassini comms are better than Cassini media teleconference comms...
Насчет телеконференции подтверждаю... :(