At present, the formation of galaxies is difficult to understand without the presence of a ubiquitous, but mysterious component, termed dark matter. Astronomers have measure how much dark matter there is around galaxies, and have found that it varies between 10 and 300 times the quantity of visible matter. However, a few years ago, the discovery of a very diffuse object, named Dragonfly 44, changed this view. It was found that this galaxy has 10,000 times more dark matter than the stars. Taken back by this finding, astronomers have made efforts to see whether this object is really anomalous, or whether something went wrong in the analysis of the observations. Now we have the answer.
An international team led by the Kapteyn Institute of the University of Groningen (the Netherlands), with participation by the Instituto de Astrofísica de Canarias (IAC) and the University of La Laguna (ULL), has found that
Using a novel technique, scientists working at the Florida State University-headquartered National High Magnetic Field Laboratory have found evidence for a quantum spin liquid, a state of matter that is promising as a building block for the quantum computers of tomorrow.
Researchers discovered the exciting behavior while studying the so-called electron spins in the compound ruthenium trichloride. Their findings, published today in the journal Nature Physics , show that electron spins interact across the material, effectively lowering
The stuff that makes up our universe is tricky to measure, to put it mildly. We know that most of the universe’s matter-energy density consists of dark energy, the mysterious unknown force that’s driving the universe’s expansion. And we know that the rest is matter, both normal and dark.
Accurately figuring out the proportions of these three is a challenge, but researchers now say they’ve performed one of the most precise measurements yet to determine the proportion of matter.
According to their calculations, normal matter and dark matter combined make up 31.5 percent of the matter-energy density of the universe. The remaining 68.5 percent is dark energy.
“To put that amount of matter in context, if all the matter in the universe were spread out evenly across space, it would correspond to an average mass density equal to only about six hydrogen atoms per cubic meter,” said astronomer Mohamed Abdullah
Many experts cast doubts on Einstein’s theory for more than a century
A new study proved Einstein’s theory of relativity aligns with present-day quantum physics
The conclusion was based on the first photo of a supermassive black hole
Albert Einstein’s theory of relativity becomes 500 times harder to negate as the first image ever taken of supermassive blackholes made a stronger case that gravity, indeed, is a matter warping spacetime. The photo of the black hole’s shadow was consistent with astrophysical findings of the much later time, therefore giving significant weight to Einstein’s idea of general relativity.
Einstein’s theory that gravity is caused by a warping spacetime has been under the scientific lens for more than 100 years. Many experts of modern times have cast their doubts on his finding, saying that it remains mathematically irreconcilable with the foundation of quantum mechanics.
One of the most puzzling components of the Universe has to be dark matter. Although we have extraordinary astrophysical evidence that the normal matter in the Universe — the stuff made out of known particles in the Standard Model — cannot account for the majority of the gravitational effects we observe, all of that evidence is indirect. We still have yet to obtain a shred of repeatable, verifiable direct evidence for whatever particle might be responsible for dark matter. The total evidence places very tight constraints on any non-gravitational interactions
A team of US astrophysicists has produced one of the most precise measurements ever made of the total amount of matter in the Universe, a longtime mystery of the cosmos.
The answer, published in The Astrophysical Journal on Monday, is that matter consists of 31.5 percent — give or take 1.3 percent — of the total amount of matter and energy that make up the Universe.
The remaining 68.5 percent is dark energy, a mysterious force that is causing the expansion of the Universe to accelerate over time, and was first inferred by observations of distant supernovae in the late 1990s.
Put another way, this means the total amount of matter in the observable Universe is equivalent to 66 billion trillion times the mass of our Sun, Mohamed Abdullah, a University of California, Riverside astrophysicist and the paper’s lead author told AFP.
A team of researchers from the U.S., Australia and the U.K. has found evidence that suggests material thrown into the atmosphere by the asteroid that struck the Earth approximately 66 million years ago, and not massive wildfires, led to a mass extinction event. In their paper published in Proceedings of the National Academy of Sciences, the group describes their study of sediment from the Chicxulub crater and other ocean areas and what it showed them.
Over the past several decades, Earth scientists have come to believe a large asteroid slammed into the Earth just off the coast of what is now Mexico’s Yucatán Peninsula approximately 66 million years ago. The impact of the asteroid strike was so great that it led to a mass extinction
A study of more than 3.5 million Nordic children suggests that the risk of autism spectrum disorder (ASD) may increase slightly for each week a child is born before or after 40 weeks of gestation. Martina Persson of the Karolinska Institutet in Stockholm, Sweden and colleagues present these findings in the open-access journal PLOS Medicine.
The causes of ASD are complex and remain unresolved, but they likely involve both genetic and environmental factors. Some previous research suggests that children born before or after their due dates (40 weeks of gestation) may have an elevated risk of ASD. However, most of those studies have been limited in scope and have not accounted for sex and birth weight.
To better understand potential links between gestational age and risk of ASD, Persson and colleagues analyzed medical registry data on more than 3.5 million children born in Sweden, Finland, or Norway between 1995
Some Walmart customers may have received PS5 price discount alerts via email, advertising incredible price-matching deals.
Those emails were probably sent by mistake, as there are no official deals on PS5 hardware or games at this time.
The two PS5 models remain out of stock at Walmart and other retailers after selling out quickly a few days ago.
The PS5 sold out even before preorders were supposed to start last week; that’s how disorganized the launch event was. Some retailers jumped the gun and allowed buyers to preorder the PS5 and PS5 Digital Edition on Wednesday, right after Sony’s virtual press event. The available stock sold immediately, and many of the gamers who attempted to place their orders on Thursday, which was the original plan, were unable to secure a PS5.
For women, there’s an inverse relationship between success and likeability. The fate of figures such as Hillary Clinton prove that the more ambition a woman exercises, the less palatable she may be perceived to be. In The Leadership, brilliant female scientists reveal the hostility they’ve encountered during field work, often undertaken in remote, high-pressure locations. Science communicator Fern Hames recalls working in an environment with 28 men and being told “we don’t have women scientists”. She also reveals that although a male colleague once left shotgun holes in her field hut, she didn’t want to be seen as ‘difficult’ by reporting it: “I didn’t want to make waves, it was my first proper job.” It’s an extreme example that illustrates how women who are successes in their fields can be vilified for simply turning up and doing their jobs.