Why has Cassini detected no waves on the lakes of Titan?
Why has Cassini detected no waves on the lakes of Titan?
Why has Cassini detected no waves on the lakes of Titan?
Tag: Cassini
Why has Cassini detected no waves on the lakes of Titan?
Cassini has found hints of activity coming from the Saturn moon Dione.
Cassini has found hints of activity coming from the Saturn moon Dione.
The spacecraft’s magnetometer has detected a faint particle stream coming from the moon, and images showed evidence for a possible liquid or slushy layer under its rock-hard ice crust. Other Cassini images have also revealed ancient, inactive fractures at Dione similar to those seen at Enceladus that currently spray water ice and organic particles.
Cassini has found hints of activity coming from the Saturn moon Dione.
The spacecraft’s magnetometer has detected a faint particle stream coming from the moon, and images showed evidence for a possible liquid or slushy layer under its rock-hard ice crust. Other Cassini images have also revealed ancient, inactive fractures at Dione similar to those seen at Enceladus that currently spray water ice and organic particles.
Cassini snaps an amazing image of Saturn’s north pole vortex.
Cassini snaps an amazing image of Saturn’s north pole vortex.
Cassini snaps an amazing image of Saturn’s north pole vortex.
Cassini has imaged meteorites as they crash into Saturn’s rings.
Cassini has imaged meteorites as they crash into Saturn’s rings.
Cassini has imaged meteorites as they crash into Saturn’s rings.
The seasons change on Titan as winter clouds begin for form over its south pole.
The seasons change on Titan as winter clouds begin to form over its south pole.
The seasons change on Titan as winter clouds begin to form over its south pole.
The science team for Cassini has released a spectacular mosiac of Saturn and its rings, backlit by the Sun.
The science team for Cassini has released a spectacular mosiac of Saturn and its rings, backlit by the Sun.
The science team for Cassini has released a spectacular mosiac of Saturn and its rings, backlit by the Sun.
A river on Titan.
New data suggests that the icy crust of Titan is twice as thick as previously estimated.
New data suggests that the icy crust of Titan is twice as thick as previously estimated.
“The picture of Titan that we get has an icy, rocky core with a radius of a little over 2,000 kilometers, an ocean somewhere in the range of 225 to 300 kilometers thick and an ice layer that is 200 kilometers thick,” [said Howard Zebker of Stanford University]. Previous models of Titan’s structure estimated the icy crust to be approximately 100 kilometers thick.
This means that the methane lakes and rivers of Titan are flowing across a bedrock of ice, which at the cold temperatures there would be as solid as rock is here on Earth.
New data suggests that the icy crust of Titan is twice as thick as previously estimated.
“The picture of Titan that we get has an icy, rocky core with a radius of a little over 2,000 kilometers, an ocean somewhere in the range of 225 to 300 kilometers thick and an ice layer that is 200 kilometers thick,” [said Howard Zebker of Stanford University]. Previous models of Titan’s structure estimated the icy crust to be approximately 100 kilometers thick.
This means that the methane lakes and rivers of Titan are flowing across a bedrock of ice, which at the cold temperatures there would be as solid as rock is here on Earth.
Cassini has taken some spectacular new images of the gigantic hexagonal vortex on Saturn’s north pole.
Cassini has taken some spectacular new images of the gigantic hexagon-shaped vortex on Saturn’s north pole.
Cassini has taken some spectacular new images of the gigantic hexagon-shaped vortex on Saturn’s north pole.
Pac Man in orbit around Saturn.
The after effects of the giant storm on Saturn.
The after effects of the giant storm on Saturn.
The after effects of the giant storm on Saturn.
The landslides of Iapetus: longer and more frequent than anywhere else in the solar system.
The landslides of Iapetus: longer and more frequent than anywhere else in the solar system.
The landslides of Iapetus: longer and more frequent than anywhere else in the solar system.
Cassini has photographed daytime lightning on Saturn.
Cassini has photographed daytime lightning on Saturn.
Cassini has photographed daytime lightning on Saturn.
Cassini has shifted its orbit so that it can look down on Saturn and its rings.
Saturn from above: Cassini has shifted its orbit so that it can look down on Saturn and its rings.
Saturn from above: Cassini has shifted its orbit so that it can look down on Saturn and its rings.
Data of the tidal fluxes on Titan by the Cassini spacecraft now suggest that there is a liquid ocean below Titan’s icy crust.
Data of the tidal fluxes on Titan by the Cassini spacecraft now suggest that there is a liquid ocean below Titan’s icy crust.
The team’s analyses suggest that the surface of the moon can rise and fall by up to 10 metres during each orbit, says Iess. That degree of warpage suggests that Titan’s interior is relatively deformable, the team reports today in Science1. Several models of the moon’s internal structure suggest such flexibility — including a model in which the moon is solid but soft and squishy throughout. But the researchers contend that the most likely model of Titan is one in which an icy shell dozens of kilometres thick floats atop a global ocean. The team’s findings, together with the results of previous studies, hint that Titan’s ocean may lie no more than 100 km below the moon’s surface.
Data of the tidal fluxes on Titan by the Cassini spacecraft now suggest that there is a liquid ocean below Titan’s icy crust.
The team’s analyses suggest that the surface of the moon can rise and fall by up to 10 metres during each orbit, says Iess. That degree of warpage suggests that Titan’s interior is relatively deformable, the team reports today in Science1. Several models of the moon’s internal structure suggest such flexibility — including a model in which the moon is solid but soft and squishy throughout. But the researchers contend that the most likely model of Titan is one in which an icy shell dozens of kilometres thick floats atop a global ocean. The team’s findings, together with the results of previous studies, hint that Titan’s ocean may lie no more than 100 km below the moon’s surface.
Watching the transit of Venus – from Saturn
Watching the transit of Venus – from Saturn.
Watching the transit of Venus – from Saturn.
Scientists studying Cassini images have spotted the trails of objects as they punch through one of Saturn’s rings.
Scientists studying Cassini images have spotted the trails of objects as they punch through one of Saturn’s rings.
Scientists studying Cassini images have spotted the trails of objects as they punch through one of Saturn’s rings.
Enceladus’s gushing geysers, as seen by Cassini.
Enceladus’s gushing geysers, as seen by Cassini.
Enceladus’s gushing geysers, as seen by Cassini.
The dunes of Titan
Engineers have gone to a back up radio system on Cassini after a primary unit did not respond as expected in late December.
Engineers have gone to a back up radio system on Cassini after a primary unit did not respond as expected in late December.
The cause is still under investigation, but age may be a factor. The spacecraft launched in 1997 and has orbited Saturn since 2004. Cassini completed its prime mission in 2008 and has had two additional mission extensions. This is the first time its ultra-stable oscillator has had an issue.
Engineers have gone to a back up radio system on Cassini after a primary unit did not respond as expected in late December.
The cause is still under investigation, but age may be a factor. The spacecraft launched in 1997 and has orbited Saturn since 2004. Cassini completed its prime mission in 2008 and has had two additional mission extensions. This is the first time its ultra-stable oscillator has had an issue.
Cassini’s top ten images for 2011
The year long mega storms of Saturn
The giant storm on Saturn
A global map of Titan, in color
Sponge in space
On August 25 Cassini did a close fly-by of the small Saturn moon Hyperion, getting as close as 15,500 miles. The mission has just released images from that fly-by.
Looks like a sponge, doesn’t it? This moon is small, only 168 miles across, which makes it about half the size of the asteroid Vesta that Dawn is presently orbiting. Why it is so peppered with craters is of course the big science question. I would guess this has something to do with the environment around Saturn, with its rings and the innumerable particles that come from it. Yet, other moons of Saturn are not as crater-filled, so there is obviously more to this than meets the eye.
This fly-by was the second closest of Hyperion that Cassini has done, the first passing over the the moon’s surface by only 310 miles. Because the irregularly-shaped moon’s rotation is more like a chaotic tumble, scientists could not predict what part of the surface they would see. To their luck the new images captured new territory.
Another fly-by is scheduled in only three weeks, on September 16, 2011. This time, however, the spacecraft won’t get as close, passing at a distance of about 36,000 miles.
What caused a giant arrow-shaped cloud on Saturn’s moon Titan?
What caused a giant arrow-shaped cloud on Saturn’s moon Titan?
What caused a giant arrow-shaped cloud on Saturn’s moon Titan?
Cassini captures a truly huge storm on Saturn.
Cassini has captured an image of a truly huge storm on Saturn. Click on the image below to see the full image.
Cassini has captured an image of a truly huge storm on Saturn. Click on the image below to see the full image.
Cassini directly samples the plumes from Enceladus and finds an ocean-like Spray
Cassini has directly sampled the plumes from Enceladus and discovered a salty ocean-like spray.
The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. The icy particles hit the detector target at speeds between 15,000 and 39,000 mph (23,000 and 63,000 kilometers per hour), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.
The data suggest a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.
Cassini has directly sampled the plumes from Enceladus and discovered a salty ocean-like spray.
The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. The icy particles hit the detector target at speeds between 15,000 and 39,000 mph (23,000 and 63,000 kilometers per hour), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.
The data suggest a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.
A storm ten times bigger than Earth
Saturn and Enceladus linked by electricity
Saturn and Enceladus linked by electricity.
Saturn and Enceladus linked by electricity.