September 22, 2022
Mohenjo
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New research could help scientists use gravitational lensing — the warping of light from distant galaxies — to investigate the accelerating expansion of the universe.
Scientists are still coming up empty in the hunt for flaws in Einstein’s theory of general relativity that could explain the mysterious force driving the accelerating expansion of the universe.
The researchers studied 100 million galaxies looking for signs that the strength of gravity has varied throughout the universe’s history or over vast cosmic distances. Any sign of such a change would indicate that Einstein’s theory of general relativity is incomplete or in need of revision. Variation could also shed light on what dark energy is, beyond that it’s the name scientists give to whatever is causing the expansion of the universe to accelerate.
Despite finding no such variations in gravity’s strength, the work will help two forthcoming space telescopes — the the European Space Agency’s Euclid mission and NASA’s Nancy Grace Roman Space Telescope — also hunt for changes in the strength of gravity through space and back through time.
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An artist’s interpretation of Einstein’s theory of general relativity. (Image credit: coffeekai via Getty Images)
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September 21, 2022
Mohenjo
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The Canyons of the Escalante is a collective name for the erosional landforms created by the Escalante River and its tributaries—the Escalante River Basin. Located in southern Utah in the western United States, these sandstone features include high vertical canyon walls, numerous slot canyons, waterpockets (sandstone depressions containing temporary rainwater deposits), domes, hoodoos, natural arches, and bridges. This area—extending over 1,500 square miles (3,885 km2) and rising in elevation from 3,600 ft (1,097 m) to over 11,000 ft (3,353 m)—is one of the three main sections of the Grand Staircase–Escalante National Monument, and also a part of the Glen Canyon National Recreation Area, with Capitol Reef National Park being adjacent to the east.
The headwaters of the Escalante River are located on the slopes of the Aquarius Plateau, in Utah’s Garfield County, just west of the town of Escalante. The Escalante River begins at the confluence of Birch Creek and North Creek, with the flow of Pine Creek added just below the town. The river runs a total distance of 80 mi (130 km) from the Birch/North Creek confluence before emptying into the Colorado River in Kane County. The lower section of the river, southeast of Coyote Gulch, is now beneath the surface of Lake Powell.
Numerous side canyons also feed the main river, accounting for the large size of the basin. From the west, the major tributaries are Harris Wash, Twentyfive Mile Creek, Coyote Gulch, Fortymile Gulch, and Fiftymile Creek, along with the smaller Phipps, Fence, and Scorpion, Davis, Clear, and Indian Creeks. Most of these larger creeks flow from the top of the Kaiparowits Plateau or from the base of its eastern edge, the Straight Cliffs Formation. An even greater number of tributaries flow in from the north and east, including Death Hollow and Calf Creeks, the combined Boulder and Deer Creeks, The Gulch, Wolverine and Silver Falls Creeks, and Choprock, Moody, Stevens, and Cow Canyons. Streams from the north flow from Boulder Mountain, while those from the northeast originate in the Circle Cliffs area, near the Waterpocket Fold in Capitol Reef National Park.
The sandstone layers now exposed in the Canyons of the Escalante were deposited during the Mesozoic era, 180 to 225 million years ago, when this area was part of a large area of dunes. Near the end of the Cretaceous period, about 80 million years ago, the entire western section of North America entered an era of uplift and mountain-building, an event known as the Laramide orogeny. More recently, additional uplift formed the Colorado Plateau province. These episodes of uplift raised the Aquarius Plateau to the extent that erosional solid forces were acting on the Escalante River Basin. Wetter climates during the recent ice ages of the Pleistocene period contributed to the deep cutting of the canyon walls.
Sandstone exposed in canyons nearer to the Colorado River is typically from the Glen Canyon Group. The dark red cliffs of Coyote Gulch, for example, are composed of Navajo Sandstone. The lighter sandstone domes of Dance Hall Rock and Sooner Rocks are formed from the higher Entrada sandstone layer. Due to the tilting of layers throughout the area, sandstone exposed at higher elevations near the town of Escalante (e.g. Deer Creek) may be from a lower layer, Wingate Sandstone. Wikipedia
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An image from Canyons Of The Escalante
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September 21, 2022
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September 21, 2022
Mohenjo
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By firing a Fibonacci laser pulse at atoms inside a quantum computer, physicists have created a completely new, strange phase of matter that behaves as if it has two dimensions of time.
The new phase of matter, created by using lasers to rhythmically jiggle a strand of 10 ytterbium ions, enables scientists to store information in a far more error-protected way, thereby opening the path to quantum computers that can hold on to data for a long time without becoming garbled. The researchers outlined their findings in a paper published July 20 in the journal Nature (opens in new tab).
The inclusion of a theoretical “extra” time dimension “is a completely different way of thinking about phases of matter,” lead author Philipp Dumitrescu, a researcher at the Flatiron Institute’s Center for Computational Quantum Physics in New York City, said in a statement. “I’ve been working on these theory ideas for over five years, and seeing them come actually to be realized in experiments is exciting.“
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The new phase was made by firing lasers at 10 ytterbium ions inside a quantum computer. (Image credit: Jurik Peter via Shutterstock)
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September 20, 2022
Mohenjo
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The koala or, inaccurately, koala bear (Phascolarctos cinereus) is an arboreal herbivorous marsupial native to Australia. It is the only extant representative of the family Phascolarctidae and its closest living relatives are the wombats. The koala is found in coastal areas of the mainland’s eastern and southern regions, inhabiting Queensland, New South Wales, Victoria, and South Australia. It is easily recognizable by its stout, tailless body and large head with round, fluffy ears, and large, spoon-shaped nose. The koala has a body length of 60–85 cm (24–33 in) and weighs 4–15 kg (9–33 lb). Fur color ranges from silver grey to chocolate brown. Koalas from the northern populations are typically smaller and lighter in color than their counterparts further south. These populations possibly are separate subspecies, but this is disputed.
Koalas typically inhabit open Eucalyptus woodland, as the leaves of these trees make up most of their diet. Because this eucalypt diet has limited nutritional and caloric content, koalas are largely sedentary and sleep up to twenty hours a day. They are asocial animals, and bonding exists only between mothers and dependent offspring. Adult males communicate with loud bellows that intimidate rivals and attract mates. Males mark their presence with secretions from scent glands located on their chests. Being marsupials, koalas give birth to underdeveloped young that crawl into their mothers’ pouches, where they stay for the first six to seven months of their lives. These young koalas, known as joeys, are fully weaned around a year old. Koalas have few natural predators and parasites but are threatened by various pathogens, such as Chlamydiaceae bacteria and the koala retrovirus.
Because of its distinctive appearance, the koala along with the kangaroos are recognized worldwide as symbols of Australia. They were hunted by Indigenous Australians and depicted in myths and cave art for millennia. The first recorded encounter between a European and a koala was in 1798, and an image of the animal was published in 1810 by naturalist George Perry. Botanist Robert Brown wrote the first detailed scientific description of the koala in 1814, although his work remained unpublished for 180 years. Popular artist John Gould illustrated and described the koala, introducing the species to the general British public. Further details about the animal’s biology were revealed in the 19th century by several English scientists. Koalas are listed as a vulnerable species by the International Union for Conservation of Nature. Among the many threats to their existence are habitat destruction caused by agriculture, urbanization, droughts, and associated bushfires, some related to climate change. In February of 2022, the koala was officially listed as endangered in the Australian Capital Territory, New South Wales, and Queensland.
The word koala comes from the Dharug gula, meaning no water. Although the vowel ‘u’ was originally written in the English orthography as “oo” (in spellings such as coola or koolah — two syllables), later became “oa” and is now pronounced in three syllables, possibly in error.
Adopted by white settlers, “koala” became one of several hundred Aboriginal loan words in Australian English, where it was also commonly referred to as “native bear”, later “koala bear”, for its supposed resemblance to a bear. It is also one of several Aboriginal words that made it into International English, alongside e.g. “didgeridoo” and “kangaroo.” The generic name, Phascolarctos, is derived from the Greek words phaskolos “pouch” and arktos “bear”. The specific name, cinereus, is Latin for “ash-colored”.
The koala was given its generic name Phascolarctos in 1816 by French zoologist Henri Marie Ducrotay de Blainville, who would not give it a specific name until further review. In 1819, German zoologist Georg August Goldfuss gave it the binomial Lipurus cinereus. Because Phascolarctos was published first, according to the International Code of Zoological Nomenclature, it has priority as the official name of the genus. French naturalist Anselme Gaëtan Desmarest proposed the name Phascolarctos fuscus in 1820, suggesting that the brown-colored versions were a different species than the grey ones. Other names suggested by European authors included Marodactylus cinereus by Goldfuss in 1820, P. flindersii by René Primevère Lesson in 1827, and P. koala by John Edward Gray in 1827. Wikipedia
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An image of a Koala, Phascolarctos Cinereus, Young on Tree, Germany
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September 20, 2022
Mohenjo
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An atom is best visualized as a tight, dense nucleus surrounded by buzzing, orbiting electrons. This picture immediately leads to a question: How do electrons keep whirling around the nucleus without ever slowing down?
This was a burning question in the early 20th century, and a search for the answer ultimately led to the development of quantum mechanics (opens in new tab) itself.
In the early 20th century, after countless experiments, physicists were just beginning to put together a coherent picture of the atom. They realized that each atom had a dense, heavy, positively charged nucleus surrounded by a cloud of tiny, negatively charged electrons. With that general picture in mind, their next step was to create a more detailed model.
In the earliest attempts at this model, scientists took their inspiration from the solar system, which has a dense “nucleus” (the sun) surrounded by a “cloud” of smaller particles (the planets). But this model introduced two significant problems.
For one, a charged particle that accelerates emits electromagnetic radiation. And because electrons are charged particles and they accelerate during their orbits, they should emit radiation. This emission would cause the electrons to lose energy and quickly spiral in and collide with the nucleus, according to the University of Tennessee at Knoxville (opens in new tab). In the early 1900’s physicists estimated that such an inward spiral would take less than one-trillionth of a second, or a picosecond. Since atoms obviously live longer than a picosecond, this wasn’t going to work.
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Our knowledge of atoms was changed forever when quantum mechanics peeked inside. (Image credit: Rost-9D via Getty Images)
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September 20, 2022
Mohenjo
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We live in a strange universe filled with unexplained phenomena that have perplexed humans since time immemorial. Scientists have pieced together a rough guide to the cosmos—known as the Lambda cold dark matter model (ΛCDM), or more simply, the standard model of cosmology—but many mysteries don’t seem to fit into this otherwise well-corroborated framework, especially as our view of space has gotten ever more precise in recent years.
Scientists are now especially preoccupied with intractable tensions that have emerged from different measurements of two cosmic properties: The rate at which our universe is expanding, known as the Hubble constant (Ho), and a value called sigma-8 (σ8), which describes variations in how matter clumps together across large cosmic scales.
Efforts to measure these properties in space have puzzlingly returned different values. When the Hubble constant is measured based on observations of brilliant stars that act as yardsticks in space, its speed is clocked as about 50,400 miles per hour per million light years. However, when it is measured using the cosmic microwave background (CMB), the oldest light in the universe, it is 46,200 miles per hour per million light years. Meanwhile, the value of sigma-8 is different when measured using the CMB, compared to other observational techniques.
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Cartwheel galaxy cat
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September 19, 2022
Mohenjo
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Seealpsee is a lake in the Alpstein range of the canton of Appenzell Innerrhoden, Switzerland. At an elevation of 1,143.2 m, the surface area is 13.6 hectares (34 acres). The lake can be reached by foot from Wasserauen or from Ebenalp. It is a popular tourist destination. A network of routes around Ebenalp connects Seealpsee with other notable sights in the Appenzell Alps, such as the Wildkirchli and Säntis.
The Berggasthaus Forelle am Seealpsee, with a large open-air terrace, dominates the western end of the lake.
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An image from Seealpsee, Switzerland
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September 19, 2022
Mohenjo
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The Universe, truly, is full of wonders, and the James Webb Space Telescope has just given us our best views of one of them yet.
The object in question is a star around 5,600 light-years away, and Webb’s infrared eye has picked out an extraordinary detail: it’s surrounded by what appear to be concentric rings of light radiating outward.
While Webb’s characteristic diffraction spikes are not ‘real’, those concentric rings are – and there’s a wonderful and fascinating explanation for them.
The star is actually a binary pair of rare stars in the constellation of Cygnus, and their interactions produce precise periodic eruptions of dust that are expanding out in shells into the space around the pair over time.
These shells of dust are glowing in infrared, which has allowed an instrument as sensitive as Webb’s MIRI to resolve them in exquisite detail.
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James Webb Space Telescope’s new image of the spectacular nebula around WR 140. (JWST/MIRI/Judy Schmidt)
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September 19, 2022
Mohenjo
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One of the most frustrating hobbies I ever took up was archery, but not because it’s hard to hit a target on the wall (it is, but I got pretty good at that). My problem was that one of the popular ways to go out and have fun with archery was to do “3D shoots,” where you would have to shoot at a series of statues of animals, each positioned at an unknown distance.
Estimating distance turned out to be my downfall. If you don’t have a good sense of how far away the fake deer is, you’ll end up shooting way over its back or burying your arrow under the ground beneath its feet. At the time, I assumed that estimating distance was less a learnable skill and more a gut feeling. Hence my surprise when I recently came across a quick eyeball-and-mental-math trick that allows anyone to estimate distance pretty accurately.
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Photo: Veranika848 (Shutterstock)
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