December 4, 2021
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Within a diamond hauled from deep beneath Earth’s surface, scientists have discovered the first example of a never-before-seen mineral.
Named davemaoite after prominent geophysicist Ho-kwang (Dave) Mao, the mineral is the first example of a high-pressure calcium silicate perovskite (CaSiO3) found on Earth. Another form of CaSiO3, known as wollastonite, is commonly found across the globe, but davemaoite has a crystalline structure that forms only under high pressure and high temperatures in Earth’s mantle, the mainly solid layer of Earth trapped between the outer core and the crust.
Davemaoite has long been expected to be an abundant and geochemically important mineral in Earth’s mantle. But scientists have never found any direct evidence of its existence because it breaks down into other minerals when it moves toward the surface and pressure decreases. However, analysis of a diamond from Botswana, which formed in the mantle around 410 miles (660 kilometers) below Earth’s surface, has revealed a sample of intact davemaoite trapped inside. As a result, the International Mineralogical Association has now confirmed davemaoite as a new mineral.
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Researchers discovered the mineral davemaoite inside a diamond that was formed in Earth’s mantle. (Image credit: Shutterstock)
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December 4, 2021
Mohenjo
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December 3, 2021
Mohenjo
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Lansing is the capital of the U.S. state of Michigan. It is mostly in Ingham County, although portions of the city extend west into Eaton County and north into Clinton County. The 2020 Census placed the city’s population at 112,644, making it the sixth-largest city in Michigan. The population of its metropolitan statistical area (MSA) was 541,297 at the 2020 Census, the third-largest in the state after metropolitan Detroit and Grand Rapids. It was named the new state capital of Michigan in 1847, ten years after Michigan became a state.
The Lansing metropolitan area colloquially referred to as “Mid-Michigan”, is an important center for educational, cultural, governmental, commercial, and industrial functions. Neighboring East Lansing is home to Michigan State University, a public research university with an enrollment of more than 50,000. The area features two medical schools, one veterinary school, two nursing schools, and two law schools. It is the site of the Michigan State Capitol, the state Supreme Court, the Court of Appeals, a federal court, the Library of Michigan and Historical Center, and headquarters of four national insurance companies.
Lansing is the only U.S. state capital (among the 47 located in counties) that is not also a county seat. The seat of government of Ingham County is Mason, but the county maintains some offices in Lansing.
The first recorded person of European descent to travel through the area that is now Lansing was British fur trader Hugh Heward and his French-Canadian team on April 24, 1790, while canoeing the Grand River. The land that was to become Lansing was surveyed as “Township 4 North Range 2 West” in February 1827 in what was then dense forest. It was the last of the county’s townships to be surveyed, and the land was not offered for sale until October 1830. There would be no roads to this area for decades to come. Wikipedia
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An image from Lansing, MI, USA
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December 3, 2021
Mohenjo
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The biggest mystery concerning the history of our universe is what happened before the big bang. Where did our universe come from? Nearly a century ago, Albert Einstein searched for steady-state alternatives to the big bang model because a beginning in time was not philosophically satisfying in his mind.
Now there are a variety of conjectures in the scientific literature for our cosmic origins, including the ideas that our universe emerged from a vacuum fluctuation, or that it is cyclic with repeated periods of contraction and expansion, or that it was selected by the anthropic principle out of the string theory landscape of the multiverse—where, as the MIT cosmologist Alan Guth says “everything that can happen will happen … an infinite number of times,” or that it emerged out of the collapse of matter in the interior of a black hole.
A less explored possibility is that our universe was created in the laboratory of an advanced technological civilization. Since our universe has a flat geometry with a zero net energy, an advanced civilization could have developed a technology that created a baby universe out of nothing through quantum tunneling.
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Credit: NASA, ESA, HEIC, and The Hubble Heritage Team (STScI/AURA)
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December 3, 2021
Mohenjo
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It’s easy to be brand loyal to the moon. We’ve only got the one, after all, unlike Jupiter and Saturn, where you’d have dozens to choose from. Here, it’s luna or nada. Or not. The fact is, there’s another sorta, kinda moon in a sorta, kinda orbit around Earth that was discovered only in 2016. And according to a new study in Nature, we may at last know how it was formed.
The quasi-moon—named Kamo’oalewa, after a Hawaiian word that refers to a moving celestial object—is not much to speak of, measuring less than 50 m (164 ft) across. It circles the Earth in a repeating corkscrew-like trajectory that brings it no closer than 40 to 100 times the 384,000 km (239,000 mi.) distance of our more familiar moon. Its odd flight path is caused by the competing gravitational pulls of the Earth and the sun, which continually bend and torque the moonlet’s motions, preventing it from achieving a more conventional orbit.
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December 3, 2021
Mohenjo
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December 2, 2021
Mohenjo
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El Capitan is a vertical rock formation in Yosemite National Park, located on the north side of Yosemite Valley, near its western end. The granite monolith is about 3,000 feet (914 m) from base to summit along its tallest face and is a popular objective for rock climbers.
The formation was named “El Capitan” by the Mariposa Battalion when they explored the valley in 1851. El Capitán (“the captain”, “the chief”) was taken to be a loose Spanish translation of the local Native American name for the cliff, variously transcribed as “To-to-kon oo-lah” or “To-tock-ah-noo-lah” (Miwok language). It is unclear if the Native American name referred to a specific tribal chief or simply meant “the chief” or “rock chief”.[5]
Tutokanula (another spelling) is found in the story The Two Bears as retold by Robert D. San Souci. In this legend, the translation means Measuring-Worm Rock.
The top of El Capitan can be reached by hiking out of Yosemite Valley on the trail next to Yosemite Falls, then proceeding west. For climbers, the challenge is to climb up the sheer granite face. There are many named climbing routes, all of them arduous, including Iron Hawk and Sea of Dreams.
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An image of El Capitan Yosemite National Park
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December 2, 2021
Mohenjo
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Where did all this come from? In every direction we care to observe, we find stars, galaxies, clouds of gas and dust, tenuous plasmas, and radiation spanning the gamut of wavelengths: from radio to infrared to visible light to gamma rays. No matter where we look or how we look at the universe, it’s full of matter and energy absolutely everywhere and at all times. And yet, it’s only natural to assume that it all came from somewhere. If you want to know the answer to the biggest question of all — the question of our cosmic origins — you have to pose the question to the universe itself, and listen to what it tells you to find out the answer.
Today, the universe as we see it is expanding, rarifying (getting less dense), and cooling. Although it’s tempting to simply extrapolate forward in time, when things will be even larger, less dense, and cooler, the laws of physics allow us to extrapolate backwards just as easily. Long ago, the universe was smaller, denser, and hotter. How far back can we take this extrapolation? Mathematically, it’s tempting to go as far as possible: all the way back to infinitesimal sizes and infinite densities and temperatures, or what we know as a singularity. This idea, of a singular beginning to space, time, and the universe, was long known as the Big Bang.
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The modern cosmic picture of our universe’s history begins not with a singularity that we identify with the Big Bang, but rather with a period of cosmic inflation that stretches the universe to enormous scales, with uniform properties and spatial flatness. The end of inflation signifies the onset of the hot Big Bang. (Credit: Nicole Rager Fuller/National Science Foundation)
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December 2, 2021
Mohenjo
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Our planet, along with the rest of the solar system and some nearby stars, may be trapped inside a giant magnetic tunnel — and astronomers don’t know why.
A tube of vast magnetized tendrils, 1,000 light-years long and invisible to the naked eye, may encircle the solar system, astronomers propose in a new paper. Jennifer West, an astronomer at the Dunlap Institute for Astronomy and Astrophysics at the University of Toronto, made the proposal after an investigation into the North Polar Spur and the Fan Region — two of the brightest radio-emitting gas structures in our galactic neighborhood — revealed that the two structures might be linked even though they are located on different sides of the sky.
“If we were to look up in the sky, we would see this tunnel-like structure in just about every direction we looked — that is, if we had eyes that could see radio light,” West said in a statement.
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The proposed giant tunnel is hundred of light-years wide, making it big enough to encompass Earth, our solar system, and even nearby stars. (Image credit: Eduard Muzhevskyi via Getty Images)
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December 2, 2021
Mohenjo
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