Astronomers have discovered unusual signals coming from the direction of the Milky Way's center. The radio waves fit no currently understood pattern of variable radio source and could suggest a new class of stellar object.

"The strangest property of this new signal is that it is has a very high polarization. This means its light oscillates in only one direction, but that direction rotates with time," said Ziteng Wang, lead author of the new study and a Ph.D. student in the School of Physics at the University of Sydney.

"The brightness of the object also varies dramatically, by a factor of 100, and the signal switches on and off apparently at random. We've never seen anything like it."

In the beginning, there was ... well, maybe there was no beginning. Perhaps our universe has always existed — and a new theory of quantum gravity reveals how that could work.

"Reality has so many things that most people would associate with sci-fi or even fantasy," said Bruno Bento, a physicist who studies the nature of time at the University of Liverpool in the U.K.

In his work, he employed a new theory of quantum gravity, called causal set theory, in which space and time are broken down into discrete chunks of space-time. At some level, there's a fundamental unit of space-time, according to this theory.

Bento and his collaborators used this causal-set approach to explore the beginning of the universe. They found that it's possible that the universe had no beginning — that it has always existed into the infinite past and only recently evolved into what we call the Big Bang.

Taurid Meteor Stream pummels planet in human history; remains menace; Nobel Prize?

A comprehensive study of the Taurid meteor stream confirms a central understanding of astronomer Dr. Bill Napier and the Comet Research Group, one which was incorporated into the YDI hypothesis from the start.

From Discover Magazine this week:

The longest-studied comets in our solar system have inspired ancient myths, religious fervor and modern scientific controversies. Now, the discovery of 88 asteroids and meteoroids orbitally aligned with one of them, Comet Encke, suggests that they all formed from the relatively recent breakup of an even bigger, icy comet. The findings are welcomed by those who believe Comet Encke and the other products of this astronomical event are responsible for many of Earth's most violent and consequential impacts over the last 20,000 years.....

.....Such a dynamic, unpredictable and well-populated complex capable of frequently getting close to Earth stoked academic imaginations; astronomers began to rewind the clock and look for evidence of Earth's interactions with the Taurids in the archaeological record and beyond. Scientist Richard Firestone, now at the Lawrence Berkeley National Laboratory, in 2007 invoked the Taurid complex to explain global climate cooling at the start of a near-glacial period called the Younger Dryas and the sudden demise of the Clovis culture, a prehistoric people thought to be the ancestors of most indigenous peoples in the Americas. And last year, a team including Napier claimed to have found their own evidence of impact during the Younger Dryas: meltglass and scorched earth deposits that appeared to mark the demise of an early hunter-gatherer community in modern-day Syria.

New Horizons has spotted two asteroid pairs in the outer solar system. Their existence sheds light on how planets formed.

NASA's New Horizons is still showing us how bizarre the outer solar system really is. A recent announcement out of the 53rd American Astronomical Society Meeting of the Division of Planetary Sciences demonstrates that two Kuiper Belt objects that the spacecraft's camera homed in on are actually each close binary pairs.

The U.S. space agency plans to conduct a mission next month to deflect a pair of asteroids far out in deep space to keep them from threatening Earth.

Dubbed the DART Mission, or the Double Asteroid Redirection Test, the National Aeronautics and Space Administration (NASA) will send spacecraft to a pair of asteroids — the Didymos binary — on November 24 aboard a SpaceX Falcon 9 rocket launched from Vandenberg Space Force Base in California.

If all goes as planned, DART will smash into one of the two asteroids, known as Didymoon, at roughly 13,500 mph nearly a full year later, on October 2, 2022.

Sixty-three percent. That's the proportion of mammal species that vanished from Africa and the Arabian Peninsula around 30 million years ago, after Earth's climate shifted from swampy to icy. But we are only finding out about it now.

Compiling decades of work, a new study published this week in the journal Communications Biology reports on a previously undocumented extinction event that followed the transition between the geological periods called the Eocene and Oligocene.

That time period was marked by dramatic climate change. In a reverse image of what is happening today, the Earth grew cooler, ice sheets expanded, sea levels dropped, forests started changing to grasslands, and carbon dioxide became scarce. Nearly two-thirds of the species known in Europe and Asia at that time went extinct.

Sets of identical twins famously have much in common with one another. In a Dutch study published September 28 in Nature Communications, scientists find that they also have something in common with other identical twins the world over: a set of matching marks on their DNA. The researchers studied around 6,000 pairs of twins of varying ages from around the world, analyzing hundreds of thousands of sites on their genomes. Their finding of 834 sites in the genome with marks distinct to identical, but not fraternal, twins could provide clues to how identical twins come about, researchers say.

Scientists from Wuhan and the US were planning to create new coronaviruses that did not exist in nature by combining the genetic codes of other viruses, proposals show.

Documents of a grant application submitted to the US Defense Advanced Research Projects Agency (Darpa), leaked last month, reveal that the international team of scientists planned to mix genetic data of closely related strains and grow completely new viruses.

A genetics expert working with the World Health Organisation (WHO), who uncovered the plan after studying the proposals in detail, said that if Sars-CoV-2 had been produced in this way, it would explain why a close match has never been found in nature.

So far the closest naturally occurring virus to Sars-CoV-2 is a strain called Banal-52, which was reported from Laos last month and shares 96.8 per cent of the genome. Yet scientists expect a direct ancestor to be around a 99.98 per cent match - and none has been found so far.

International research team led by University of Göttingen finds atomically-thin carbon generates its own magnetic field.
Usually, the electrical resistance of a material depends very much on its physical dimensions and fundamental properties. Under special circumstances, however, this resistance can adopt a fixed value that is independent of the basic material properties and "quantised" (meaning that it changes in discrete steps rather than continuously). This quantisation of electrical resistance normally occurs within strong magnetic fields and at very low temperatures when electrons move in a two-dimensional fashion. Now, a research team led by the University of Göttingen has succeeded in demonstrating this effect at low temperatures in the almost complete absence of a magnetic field in naturally occurring double-layer graphene, which is just two atoms thick. The results of the study have been published in Nature.

The team from the University of Göttingen, Ludwig Maximilian University of Munich and the University of Texas (Dallas) used two-layer graphene in its natural form. The delicate graphene flakes are contacted using standard microfabrication techniques and the flake is positioned so that it is hangs freely like a bridge, held at the edges by two metal contacts. The extremely clean double-layers of graphene show a quantisation of electrical resistance at low temperatures and almost undetectable magnetic fields. In addition, the electrical current flows without any loss of energy. The reason for this is a form of magnetism that is not generated in the usual way as seen in conventional magnets (ie by the alignment of the intrinsic magnetic moments of electrons), but by the motion of the charged particles in the graphene double layer itself. "In other words, the particles generate their own intrinsic magnetic field, which leads to the quantisation of the electrical resistance," says Professor Thomas Weitz from the University of Göttingen.

What did the Early Bronze Age men and women of the Argaric culture in the southeastern Iberian Peninsula look like? Researchers at the UAB have analysed the facial features of these individuals based on the digital and biological study of the skulls recovered at the sites of La Almoloya and La Bastida (Murcia), and have obtained images of 40 of their inhabitants. The study, the first to apply this method to such a large group of individuals from the same prehistoric site, is part of a more ambitious project being conducted by the research group on the Argaric society ASOME-UAB, which focuses on kinship relationships in prehistoric times.

Our faces contain information about our family history and lifestyle. For example, certain facial traits can be passed down from parents to children for generations. Is it therefore possible that the physical resemblances among a group of individuals can provide clues about common blood ties?

This is one of the main objectives of a research being carried out by the group of Social and Mediterranean Archaeoecology (ASOME) at the Universitat Autònoma de Barcelona (UAB) on the Argaric society, which expanded throughout the southeastern part of the Iberian Peninsula some 4,000 years ago and was one of the first urban societies in Western Europe. And the first step has been the work of Joana Bruno, researcher at ASOME-UAB, archaeologist and master in science illustration, who was in charge of the facial reconstruction of 38 individuals from El Argar, selected after a detailed osteological study of more than 250 skeletons recovered from well-preserved tombs of La Almoloya and La Bastida.