A dying star located on the outskirts of the Milky Way is the hottest white dwarf ever found in our galaxy, boasting a record-setting temperature of 250,000 degrees Celsius despite the fact that it has already entered its cooling phase, according to a new study.
Writing in the journal Astronomy & Astrophysics, a team of astronomers from the University of Tübingen reported that analysis of ultraviolet spectra taken by the Hubble Space Telescope show that the white dwarf RX J0439.8-6809 has a temperature of a quarter of a million degrees.
Such extreme heat can only be reached by a star five times more massive than the sun, and even more remarkably, the white dwarf is already in the process of cooling down. At its peak about 1,000 years ago, RX J0439.8-6809 likely reached a maximum of 400,000 degrees.
Previously, the hottest temperature observed on a dying star was measured to be 200,000 degrees Celsius, the study authors said. For the sake of reference, our sun’s surface temperature has been a fairly constant 6,000 degrees since it was born 4.6 million years ago.
The study authors added that they witnessed an intergalactic gas cloud moving towards the Milky Way for the first time. This, they explained, would suggest that at least some galaxies gather new materials from deep space and use those substances to manufacture new stars.
The chemical composition of RX J0439.8-6809 is not yet fully understood. The star, which was first discovered two decades ago, appears to have both carbon and oxygen on its surface. Those elements are the products of the nuclear fusion of helium, but in most cases, that process occurs deep within the core of a star, the researchers said.
Recently, my geeky hobby photography went viral. I saw my photos pop up on blogs, websites and even in a clickbait article after I posted my first article on here. Since then I've taken some more photos in and around London and also on trips away to Malta and Dublin, so I thought I'd write a part two.
Il dépose des pâtes dans une poêle le résultat changera a jamais votre façon de cuisiner les pâtes. Normalement toutes les recettes de pâtes suggèrent de faire bouillir une grande quantité d’eau avant d’y plonger les pâtes, il semblerait que tout cela n’est qu’une supercherie !
por Carlos Eduardo Nava CondarcoHay mucho más que una frase bonita en la demanda de aprender a ser una persona agradecida. El GRACIAS tiene enorme Poder para caminar por la Vida: Poder práctico y concreto.Los seres humanos somos finalmente una compleja y delicada maquinaria que funciona día a día tratando de alcanzar objetivos, resolver problemas, crear futuro, superar dificultades, avanzar, disfrutar, descansar, sentir contento y gozo. Todo ello provoca efectos diferentes en el estado anímico
A new study reports conditions which are extremely noisy can alter taste perception for sweet and umami flavors.
"Eating is a fundamentally multisensory experience: we don’t just eat our food, we also see it, smell it, and hear ourselves chewing it. However, perception of non-food components of the dining experience can also influence flavor perception. For instance, desserts are rated as sweeter if they are presented on a white vs. black plate, and exposure to loud noise reduces affective food ratings."
A new study shows that age-related differences in brain health – specifically the strength of connections between different regions of the brain – vary with fitness level in older adults. The findings suggest that greater cardiorespiratory fitness – a measure of aerobic endurance – relates to stronger brain connections and likely improves long-term brain function in aging populations.
The study results are reported in the journal NeuroImage.
Michelle Voss led the study while a postdoctoral researcher at the University of Illinois with Beckman Institute director Arthur Kramer and kinesiology and community health professor Edward McAuley. Voss now is an assistant professor at the University of Iowa.
“Our study provides the strongest evidence to date that fitness in an older adult population can have substantial benefits to brain health in terms of the functional connections of different regions of the brain,” Kramer said.
There are many ways to measure brain health across the lifespan. One popular technique measures the strength of connections between different parts of the brain while the person is completing a task or during wakeful rest. The latter is known as resting-state functional connectivity. Research has shown that some of these connections weaken with increasing age and indicate deteriorating brain health.
Mystery Boy Brandon Keesing was incorrectly diagnosed with a degenerative muscular disease until revolutionary genetic sequencing gave him life-changing news.
Originally thought that Keesing has a mitochondrial disease, doctors had been wrong all along. Revolutionary advances in genetic sequencing proved he did not have mitochondrial disease at all. "In recent years the capacity to read the genetic code of every single gene — all 20,000 of them in the human body — has reached a point where it is now efficient, accurate, cost-effective to be able to do this," he says.
The new technique is called "next generation sequencing" — and where previously it took weeks or months to analyse the code of a single gene, today laboratory computers can decode all 20,000 genes in one go.
Almost immediately Westmead Children's Hospital researchers could pinpoint which one of Brandon's genes had a mutation. Professor Christodoulou illustrates how the technique works on a chart. "So here in the unaffected individual we have an 'A'. Here in the affected individual we have a 'G'. And that's precisely where the mistake is," he says.
Doctors using next generation sequencing discovered in fact that Brandon had congenital myasthenia — a different genetic disease which also affects the muscles. But although incurable, it is not usually fatal and can be treated with medication.
"The name of the gene that we found the mistakes in is called COLQ, and it has a completely different role," Professor Christodoulou says. "It has nothing to do with mitochondrial energy production. "What it is involved in is co-ordinating the communication of nerve cells with the muscle, so that the muscle, when it receives an impulse from a nerve cell, it contracts and relaxes appropriately.
"So the problem with the COLQ mistakes is that this process couldn't be co-ordinated properly. And that's what actually led to his progressive problems."
Finding that one gene in 20,000 has transformed Brandon's life. A simple drug quickly restored some of his muscle strength. As quickly as he had deteriorated as a toddler, he suddenly began making huge strides.
"We noticed it straight away. By the end of that week he got up off that bed and he walked," she says, wiping away tears. "That was unreal. I'll never forget that day. I was so happy for him and ... I just knew from that he was going to grow, he was going to enjoy his life that much more than what he had before. And he has."
Professor Christodoulou says it was a very gratifying outcome for doctors.
por Carlos Nava Condarco - Hay diferencia importante de grado entre el Temor y el Miedo. Y cuando se trata de la posibilidad de Perder, el hombre tiene esto último, nada menos. Esta actitud no es producto de algo que tenga poca importancia, el miedo a Perder es un reflejo del carácter de las personas, de la visión que tienen de la vida y de sí mismos. Este miedo gobierna a la gente y la inhabilita para progresar, la aleja, como pocas cosas, de la prosperidad.
A new study shows that students who use symmetry to learn about numbers tap into critical brain circuits.
"Building on new discoveries about how the brain grapples with abstract mathematics, researchers at Stanford Graduate School of Education have developed a classroom strategy for teaching children the often baffling concepts surrounding negative numbers.
"The new strategy recruits the brain's use of visual symmetry to make sense of the physical world, and it could have profound implications for the way elementary schools teach math.
"Using symmetry appears to have helped not just in teaching children about negative numbers but in improving their ability to solve higher-level math problems they haven't seen before."
"As part of a four-hour curriculum on integers, fourth-grade students played games using a special number line that could be folded in half at the zero point, allowing the symmetry between positive and negative quantities to stand out."
If you love perusing photography blogs, but get confused when photography terms such as depth of field, aperture or bokeh pop up, you are not alone. But as you move from hobbyist to enthusiast in the field of photography, it helps to know the technical terms that professionals use. This glossary of essential photography terms will help you take your knowledge, and your photos, to the next level. By tinyprints
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