WILMINGTON, Del.--(BUSINESS WIRE)--Nov 21, 2023--

(Reuters) -Apple Inc has acquired Mira, a Los Angeles-based AR startup that makes headsets for other companies and the U.S.

How Barcelona midfielder Gavi's minutes compare with Pedri after his serious knee injury.

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.

Jimmy and Rosalynn Carter are marking their 77th wedding anniversary with a quiet Friday at their south Georgia home, extending their record as the longest-married first couple ever as both face significant health challenges

Though Week 13's Thursday Night Football matchup played itself out much like a duel between two playoff teams, ultimately the result of the game had little imme

Sir Paul McCartney was pleased that Guns N' Roses covered his Bond theme 'Live and Let Die' in 1991, although no one would believe his kids when they would boast that their dad actually wrote the rock classic.

England has made the bold decision to start Marcus Smith at fullback for the Rugby World Cup quarterfinal against Fiji on Sunday in Marseille

Barry Dean McBurney Jr has been charged with carjacking and aggravated battery of a law enforcement officer

(Reuters) -Bottler Coca-Cola HBC AG raised its 2023 profit expectation on Friday, aided by robust sales and price increases in

As anticipation builds for former President Donald Trump to be indicted for the third time this year, investigators in the special counsel's election interference probe are expected to speak with additional witnesses over the next several weeks, including at least one former Trump attorney.

Robert F. Kennedy Jr.'s campaign on Sunday evening quickly tried to walk back comments the Democratic presidential candidate had made earlier in the day in support of a nationwide abortion restriction after the first three months of pregnancy.