In a recently published study, a team of researchers led by the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) at Monash university suggests an innovative method to analyse gravitational waves from neutron star mergers, where two stars are distinguished by type (rather than mass), depending on how fast they’re spinning.
Neutron stars are extremely dense stellar objects that form when giant stars explode and die—in the explosion, their cores collapse, and the protons and electrons melt into each other to form a remnant neutron star.
In 2017, the merging of two neutron stars, called GW170817, was first observed by the LIGO and Virgo gravitational-wave detectors. This merger is well-known because scientists were also able to see light produced from it: high-energy gamma rays, visible light, and microwaves. Since then, an average of three scientific studies on GW170817 have been published every
Black holes are perhaps the strangest, least-understood objects in our universe. With so much potential — being linked to everything from wormholes to new baby universes — they have sucked in physicists for decades.
But as strange as these known objects are, even stranger types of black holes could be dreamed up. In one upside-down, hypothetical version of the universe, a bizarre type of black hole could exist that is stranger than an M.C. Escher sketch. Now, a team of researchers has plunged into the mathematical heart of so-called charged black holes and found a slew of surprises, including an inferno of space-time and an exotic fractal landscape … and potentially more.
Physicists tested sound as it travels through different materials
Sound can almost reach its upper limit when traveling in solid atomic hydrogen
The finding is vital in different fields of studies like materials science and condensed matter physics
Sound waves can travel to up to 36 kilometers or more than 22 miles per second when traveling through solids or liquids, a new study by a team of physicists revealed. The physicists said that their calculation could be the first known variables representing the threshold of sound waves.
Before this new finding, the speed of sound was measured based on Albert Einstein’s theory of special relativity that identified sound waves threshold similar to that of the speed of light (300,000 kilometers or over 186,000 miles per second).
In a study, published in the journal Science Advances, the physicists said to calculate for the threshold of the speed of sound,
No matter how we look at the Universe — at low temperatures or ultra-high energies, from our own backyard to the most distant recesses of the observable cosmos — we find that the same laws of physics apply. The fundamental constants remain the same; gravitation appears to behave the same; the quantum transitions and relativistic effects are identical. At all points in time, at least for the parts of the Universe we can observe, General Relativity (governing gravity) and Quantum Field Theory (governing the other known forces) appear to apply in the exact same form we find them appearing here on Earth. But has it always been this way? Is there a time where
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
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.
Black holes can get big … really big. But just how big? It’s possible they could top out at over a trillion times more massive than the sun. That’s 10 times bigger than the largest known black hole so far.
But could these monsters truly exist in our universe? A team of researchers has come up with a plan to go hunting for them. And if they exist, they could help us solve the mysteries of how the first stars appeared in the cosmos.
Related: The biggest black hole findings
The demographics of the dark
If you want to go shopping for black holes in the universe, unfortunately you only have two basic sizes: kind of small and gigantic. You know that frustrating feeling you get when the online store is out of your size of that amazing
Eight months after the space telescope CHEOPS started its journey into space, the first scientific publication using data from CHEOPS has been issued. CHEOPS is the first ESA mission dedicated to characterising known exoplanets. Exoplanets, i.e. planets outside the Solar system, were first found in 1995 by two Swiss astronomers, Michel Mayor and Didier Queloz, who were last year awarded the Nobel Prize for this discovery. CHEOPS was developed as part of a partnership between ESA and Switzerland. Under the leadership of the University of Bern and ESA, a consortium of more than a hundred scientists and engineers from eleven European states was involved in constructing the satellite over five years. The Science Operations Center of CHEOPS is located at the observatory of the University of Geneva.
Using data from CHEOPS, scientists have recently carried out a detailed study of the exoplanet WASP-189b. The results have just been accepted for
On Thursday, a second BTS game was released — this time called BTS Universe Story. The game is only available on Android and the Apple app store. It’s based on an ongoing storyline that has been told through music videos, books, performances, and songs since 2015.
Fans have been decoding and analyzing the hundreds of theories that have come out of the “universe” since then. Now, there is a game that will allow fans to immerse themselves in it.
It also comes with another function that allows players to create their own storylines using the BTS characters.
The app’s creators intended for fans to create their own versions of the universe’s story, but instead some fans have been re-creating memes and iconic moments from TV and the internet.
For example, the meteor/meatier meme got the game treatment and so did many others.
The temporal evolution of the universe, from the Big Bang to the present, is described by Einstein’s field equations of general relativity. However, there are still a number of open questions about cosmological dynamics, whose origins lie in supposed discrepancies between theory and observation. One of these open questions is: Why is the universe in its present state so homogeneous on large scales?
From the Big Bang to the present
It is assumed that the universe was in an extreme state shortly after the Big Bang, characterized in particular by strong fluctuations in the curvature of spacetime. During the long process of expansion, the universe then evolved towards its present state, which is homogeneous and isotropic on large scales — in simple terms: the cosmos looks the same everywhere. This is inferred, among other things, from the measurement of the so-called background radiation, which appears highly uniform in every direction