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Comment by Mrs.B on May 11, 2017 at 8:39pm

What a great view!

Comment by Stephen on May 11, 2017 at 8:32pm

Loki Patera on Jupiter’s innermost moon is a giant bowl of molten rock – but it doesn’t behave like one

Loki Patera on Jupiter’s innermost moon is a giant bowl of molten rock – but it doesn’t behave like one

Waves surge in opposite directions around Io’s largest lava lake

Surf’s up on Jupiter’s moon. Magma waves travelling both clockwise and anticlockwise have been spotted on the surface of a lava lake on Io, the most volcanically active body in the solar system.

The lake, called Loki Patera, is a bowl-shaped volcanic crater on Io, Jupiter’s innermost moon. It is roughly 200 kilometres across, and responsible for 10 to 20 per cent of the heat that the jovian moon puts out.

We’ve known that Loki periodically brightens and dims since the 1970s. Previous observations suggested that these changes are due to the lake recycling itself. As the top layer of lava cools, it solidifies and grows dense, until eventually it sinks beneath the underlying magma and pulls nearby crust with it in waves moving across the surface.

But most of those observations, based on a technique for reducing atmospheric blurring called adaptive optics, were only sharp enough to tell which direction the waves were moving, not how fast or where they started.

Now, Katherine de Kleer at the University of California, Berkeley and her colleagues have taken advantage of a rare collusion between Jupiter’s moons to get a high-quality time lapse of the lava lake’s surface.

Time-lapse images of the lake’s surface reveal how its surface regenerates

Every six years, the orbits of Io and Europa – a moon of Jupiter best known for its ice shell covering a liquid water ocean – align, then cross one another from the point of view of Earth.

Read more=read:https://www.newscientist.com/article/2130654-waves-surge-in-opposit...

Comment by doone on May 9, 2017 at 3:07pm

How far is the edge of the Universe from the farthest galaxy? Wow, was the Universe expanding fast in the past!

Comment by Stephen on May 7, 2017 at 12:28pm

Comment by Chris on May 5, 2017 at 4:57am

The City Dark is an interesting documentary about light pollution.

Comment by Mrs.B on May 5, 2017 at 2:01am

Amazing stuff.

Comment by Stephen on May 4, 2017 at 8:35pm

Comment by Stephen on May 2, 2017 at 5:54pm

The sounds and spectrograms in these two videos represent data collected by the Radio and Plasma Wave Science, or RPWS, instrument on NASA's Cassini spacecraft, as it crossed the plane of Saturn's rings on two separate orbits.Credits: NASA/JPL-Caltech/University of IowaView videos and full caption

The sounds and spectrograms in these two videos represent data collected by the Radio and Plasma Wave Science, or RPWS, instrument on NASA's Cassini spacecraft, as it crossed the plane of Saturn's rings on two separate orbits.Credits: NASA/JPL-Caltech/University of IowaView videos and full caption

Cassini Finds 'The Big Empty' Close to Saturn

As NASA's Cassini spacecraft prepares to shoot the narrow gap between Saturn and its rings for the second time in its Grand Finale, Cassini engineers are delighted, while ring scientists are

puzzled, that the region appears to be relatively dust-free. This assessment is based on data Cassini collected during its first dive through the region on April 26.

With this information in hand, the Cassini team will now move forward with its preferred plan of science observations.

"The region between the rings and Saturn is 'the big empty,' apparently," said Cassini Project Manager Earl Maize of NASA's Jet Propulsion Laboratory in Pasadena, California. "Cassini will stay the course, while the scientists work on the mystery of why the dust level is much lower than expected."

A dustier environment in the gap might have meant the spacecraft's saucer-shaped main antenna would be needed as a shield during most future dives through the ring plane. This would have forced changes to how and when Cassini's instruments would be able to make observations. Fortunately, it appears that the "plan B" option is no longer needed. (There are 21 dives remaining. Four of them pass through the innermost fringes of Saturn's rings, necessitating that the antenna be used as a shield on those orbits.)

Based on images from Cassini, models of the ring particle environment in the approximately 1,200-mile-wide (2,000-kilometer-wide) region between Saturn and its rings suggested the area would not have large particles that would pose a danger to the spacecraft.

But because no spacecraft had ever passed through the region before, Cassini engineers oriented the spacecraft so that its 13-foot-wide (4-meter-wide) antenna pointed in the direction of oncoming ring particles, shielding its delicate instruments as a protective measure during its April 26 dive.

Read more= read:https://www.nasa.gov/feature/cassini-finds-the-big-empty-close-to-s...

Comment by Mrs.B on April 26, 2017 at 1:52am

So well spoken for his youth.

Comment by Stephen on April 25, 2017 at 8:49pm

The Fine Tuning Argument and the Beauty of Science - Alex O'Connor vs Josh Parikh radio preview

 
 
 

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