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RIVNE, Ukraine--(BUSINESS WIRE)--Jun 13, 2023--

Many of us look to the stars for answers to life’s most complex questions. But actually, some of the greatest mysteries lie beneath our very feet. One might think we’d know the Earth pretty well by now but, in fact, our planet’s core remains shrouded in enigma. Indeed, there are two gigantic blobs located beneath Africa and the Pacific Ocean that occupy around six per cent of the world’s entire volume. And yet, we’re still not entirely sure what they’re made of or where they came from. There are a number of hypotheses, including that they are piles of oceanic crust that have accumulated over billions of years. Sign up for our free Indy100 weekly newsletter But a more interesting theory is that they are huge chunks of an ancient planet that hit the Earth around 4.5 billion years ago. To give an indication of just how massive these things are, the structure under Africa – an area known as Tuzo – is thought to be around 800km (497 miles) tall – the equivalent of some 90 Mount Everests stacked on top of one another, as IFLScience notes. The problem with determining the origin of these monster formations is that there are no direct ways of observing the Earth’s core. The deepest hole humans have ever dug – branded the "entrance to hell" – reached a pretty staggering 12,263m (40,230ft), but that doesn’t even come close to breaking through the crust to the layers beneath. Our most effective tool for analysing what lies beneath the ground is a technique called seismic tomography, which looks at how waves of energy travel when earthquakes occur. Since rocks and liquids have different densities, the waves move through them at different speeds. By measuring the tremors from different points on the surface, geologists can determine what kind of material the waves are travelling through and, in so doing, map out the Earth’s interior. It was by using this technique that the two unusual structures – known as large low shear velocity provinces (LLSVPs) – were found. Waves travel more slowly in these areas – fondly known as “blobs” – than through the surrounding lower mantle, indicating that they’re made of something different. We can’t tell what this material is based on seismic tomography data alone, but some scientists like to believe that they are the remnants of an ancient planet called Theia – an idea known as the “giant impact hypothesis”. According to this hypothesis, around 4.5 billion years ago, a Mars-sized object collided with the Earth. This impact not only created the planet we call home today, but also threw off enough rock to form the moon that lights up our night skies. Some scientists suggest that some of Theia’s leftovers also sunk to the bottom of the planet, probably settling somewhere above the core – thereby forming at least one of the two LLSVPs. More Updates About Strange Blob Structures Inside Planet Earth youtu.be Experts have been investigating the area for decades but there’s still no way of knowing for sure just what these two giant blobs are. Still, studies into Theia have offered important insights into how the possible collision might have kickstarted key plate tectonic and mantle motion inside our planet – crucial processes for establishing the world on which we live. It’s also a useful reminder that we still have so much to learn about our planet and where we came from. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

CANCUN, Mexico--(BUSINESS WIRE)--Aug 31, 2023--

NASA is turning its attention from the stars to our screens, after it announced it will launch its own streaming service. The organisation announced that it is launching a beta for a streaming platform with the name NASA+ – and yes, the plus is shaped to look like a star. It looks like the streaming service will be ad-free and available to watch on the new beta site and the NASA app. Essentially, it’ll work a little like Netflix for space content, updating the current Nasa TV output which features livestreams of rocket launches and other events. Sign up to our free Indy100 weekly newsletter There’s not much information out there about the new platform but it’ll come “later this year” and NASA has stated that it won’t require a paid subscription. NASA communications administrator Marc Etkind said in the press release that the organisation has designed the platform around “putting space on demand at your fingertips”. Introducing NASA's On-Demand Streaming Service, NASA+ (Official Trailer) www.youtube.com Judging by the look of the new promo clip, it’ll feature a lot of educational videos and public content as well as documentaries. “Modernizing our main websites from a technology standpoint and streamlining how the public engages with our content online are critical first steps in making our agency’s information more accessible, discoverable, and secure,” said NASA chief information officer Jeff Seaton. Meanwhile, it comes after Nasa celebrated the first birthday of the James Webb Space Telescope this summer by releasing extraordinary images of stars 'being born'. In the images, which almost look surreal, rainbow bursts with tiny twinkles can be seen. "The darkest areas are the densest, where thick dust cocoons still-forming protostars", the space giants say. These occur when a star first bursts through its natal envelope of cosmic dust, shooting out a pair of opposing jets into space like a newborn first stretching her arms out into the world." Nasa also recently stated that it discovered “diverse organic matter” on the surface of Mars, which could change our understanding of the red planet and the search for life in the universe. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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