Science
Earth’s core may be cooling faster than scientists thought
Earth’s core has been cooling since Earth formed about 4.5 billion years ago, when the entire surface was covered in a magma ocean.
A study published Jan. 15 challenges scientific understanding of how fast this cooling occurs, showing that the process is moving much faster than scientists thought.
The findings, by researchers from Switzerland, Germany, the United States and Japan, add to support from a flurry of studies that radiation plays a larger role in extracting heat from Earth’s core than previously assumed.
The core-mantle boundary lies between Earth’s lower mantle and its liquid core. Scientists believe it is mainly composed of a mineral called bridgemanite, named after physicist Percy Bridgeman in 2014. Scientists believe that Bridgeman rock is the most abundant mineral on Earth.
“We finally found that [bridgmanite’s] previous thermal conductivity values were severely underestimated,” said Motohiko Murakami, professor of earth sciences at ETH Zurich and lead author of the study.
Takashi Murakami and his colleagues found that the thermal conductivity of Bridgemanite was 1.5 times higher than expected.
“Heat transfer from the core will be more efficient than previously thought, which ultimately causes the core to cool faster than expected,” Murakami said.
Complete News Source : DW
Science
Nasa’s old map of Jupiter, which reminds many of dosa, has gone viral once more
Certain images or videos frequently resurface on the Internet, leaving people speechless. When those clips or pictures are shared again on one social media platform or another, they create a buzz. The National Aeronautics and Space Administration (Nasa) created and posted this image of a map of Jupiter online a few years ago. After being shared on Twitter, the image drew a lot of attention this time. And, as usual, the image made people think of dosa, a popular South Indian dish.
The image was shared by the Twitter account Latest in Space. “From the very bottom of Jupiter, I’m looking up. While tweeting the image, they wrote, “Seen by NASA Cassini.” The images from the Cassini spacecraft’s narrow-angle camera were used to create this out-of-this-world image, which is part of a coloured map series produced by the space agency.
The article was published a few days ago. The tweet has received nearly 20,000 likes since it was shared, and the number is growing. The tweet has been retweeted more than 2,000 times. Take a look at some of the comments to see how the image of Jupiter looks like dosa.
A Twitter user commented, “Looks like a designer dosa.” “When I rush to pick up a call, this is what happens to my dosa on the dosa pan,” one joked. “This is how my mother makes Dosa,” a third said. “Jupiter in the making,” wrote a fourth, along with a photo of someone preparing – you guessed it – dosa.
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