Top Stories Daily Listen Now
RawStory

Science

It’s a bad year for California salmon. Here’s how it hurts the economy and environment

State officials were supposed to take a conservative approach to approving salmon fishing season this year — and they did. California’s fishing season had been scheduled to open April 1. Instead, as a result of low salmon projections, the seasonhas been canceled. Salmon provides more to the state than meets the eye. “People don’t realize how much California’s a salmon state,” said Micheal Milstein, a National Oceanic and Atmospheric Administration spokesman. “The Sacramento River is one of the big salmon rivers off the West Coast.” As commercial and sport fishing comes to a pause this year, he...

What are auroras, and why do they come in different shapes and colors? Two experts explain

Over millennia, humans have observed and been inspired by beautiful displays of light bands dancing across dark night skies. Today, we call these lights the aurora: the aurora borealis in the northern hemisphere, and the aurora australis in the south.

Nowadays, we understand auroras are caused by charged particles from Earth’s magnetosphere and the solar wind colliding with other particles in Earth’s upper atmosphere. Those collisions excite the atmospheric particles, which then release light as they “relax” back to their unexcited state.

Keep reading... Show less

Ancient DNA is restoring the origin story of the Swahili people of the East African coast

The legacy of the medieval Swahili civilization is a source of extraordinary pride in East Africa, as reflected in its language being the official tongue of Kenya, Tanzania and even inland countries like Uganda and Rwanda, far from the Indian Ocean shore where the culture developed nearly two millennia ago.

Its ornate stone and coral towns hugged 2,000 miles (3,200 kilometers) of the coast, and its merchants played a linchpin role in the lucrative trade between Africa and lands across the ocean: Arabia, Persia, India, Southeast Asia and China.

Keep reading... Show less

Astronomers discover one of biggest black holes ever recorded

One of the largest black holes ever recorded has been discovered using a new technique that could spot thousands more of the insatiable celestial monsters in the coming years, according to astronomers.

The ultramassive black hole, one of just four ever observed, is more than 30 billion times the mass of the Sun, a new study said.

Keep reading... Show less

Scientists turn to coconuts to save the New Jersey coastline

Ecologist Shane Godshall tromps in waders through two feet of mud in Thompsons Beach marsh on the Delaware Bay in Heislerville, in New Jersey's Cumberland County. He pauses, then sticks his hand in the ooze and pulls out a piece of the secret weapon scientists have been deploying to fight erosion from climate change and to save America’s coastline: the coconut. More accurately, it’s the fibrous outer husk of the coconut shell called coir (pronounced koy-uh, but often referred to as core). Typically, coir is packed into 10-foot logs tied together by biodegradable twine. Many of the $80 to $169 ...

How the natural gas industry cozies up to utility regulators

This story was originally published by Grist. You can subscribe to its weekly newsletter here.

Last November, in a vast conference hall at a Marriott hotel in New Orleans, utility executive Kim Greene took the stage. Greene, the CEO of Southern Company Gas, a Georgia-based conglomerate that owns gas utilities across four states, was the first to speak on a panel titled “The Role for Natural Gas in America’s Clean Energy Future.”*

Keep reading... Show less

For the first time, astronomers have linked a mysterious fast radio burst with gravitational waves

We have just published evidence in Nature Astronomy for what might be producing mysterious bursts of radio waves coming from distant galaxies, known as fast radio bursts or FRBs.

Two colliding neutron stars – each the super-dense core of an exploded star – produced a burst of gravitational waves when they merged into a “supramassive” neutron star. We found that two and a half hours later they produced an FRB when the neutron star collapsed into a black hole.

Or so we think. The key piece of evidence that would confirm or refute our theory – an optical or gamma-ray flash coming from the direction of the fast radio burst – vanished almost four years ago. In a few months, we might get another chance to find out if we are correct.

Brief and powerful

FRBs are incredibly powerful pulses of radio waves from space lasting about a thousandth of a second. Using data from a radio telescope in Australia, the Australian Square Kilometre Array Pathfinder (ASKAP), astronomers have found that most FRBs come from galaxies so distant, light takes billions of years to reach us. But what produces these radio wave bursts has been puzzling astronomers since an initial detection in 2007.

The best clue comes from an object in our galaxy known as SGR 1935+2154. It’s a magnetar, which is a neutron star with magnetic fields about a trillion times stronger than a fridge magnet. On April 28 2020, it produced a violent burst of radio waves – similar to an FRB, although less powerful.

Astronomers have long predicted that two neutron stars – a binary – merging to produce a black hole should also produce a burst of radio waves. The two neutron stars will be highly magnetic, and black holes cannot have magnetic fields. The idea is the sudden vanishing of magnetic fields when the neutron stars merge and collapse to a black hole produces a fast radio burst. Changing magnetic fields produce electric fields – it’s how most power stations produce electricity. And the huge change in magnetic fields at the time of collapse could produce the intense electromagnetic fields of an FRB.

A black field with two illustrations of galaxies in the foreground, and a yellow beam connecting them

Artist’s impression of a fast radio burst traveling through space and reaching Earth. ESO/M. Kornmesser, CC BY

The search for the smoking gun

To test this idea, Alexandra Moroianu, a masters student at the University of Western Australia, looked for merging neutron stars detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in the US. The gravitational waves LIGO searches for are ripples in spacetime, produced by the collisions of two massive objects, such as neutron stars.

LIGO has found two binary neutron star mergers. Crucially, the second, known as GW190425, occurred when a new FRB-hunting telescope called CHIME was also operational. However, being new, it took CHIME two years to release its first batch of data. When it did so, Moroianu quickly identified a fast radio burst called FRB 20190425A which occurred only two and a half hours after GW190425.

Exciting as this was, there was a problem – only one of LIGO’s two detectors was working at the time, making it very uncertain where exactly GW190425 had come from. In fact, there was a 5% chance this could just be a coincidence.

Worse, the Fermi satellite, which could have detected gamma rays from the merger – the “smoking gun” confirming the origin of GW190425 – was blocked by Earth at the time.

A nighttime view of white curved pipes arranged in a grid pattern

CHIME, the Canadian Hydrogen Intensity Mapping Experiment, has turned out to be uniquely suited to detecting FRBs. Andre Renard/Dunlap Institute/CHIME Collaboration

Unlikely to be a coincidence

However, the critical clue was that FRBs trace the total amount of gas they have passed through. We know this because high-frequency radio waves travel faster through the gas than low-frequency waves, so the time difference between them tells us the amount of gas.

Because we know the average gas density of the universe, we can relate this gas content to distance, which is known as the Macquart relation. And the distance travelled by FRB 20190425A was a near-perfect match for the distance to GW190425. Bingo!

So have we discovered the source of all FRBs? No. There are not enough merging neutron stars in the Universe to explain the number of FRBs – some must still come from magnetars, like SGR 1935+2154 did.

And even with all the evidence, there’s still a one in 200 chance this could all be a giant coincidence. However, LIGO and two other gravitational wave detectors, Virgo and KAGRA, will turn back on in May this year, and be more sensitive than ever, while CHIME and other radio telescopes are ready to immediately detect any FRBs from neutron star mergers.

In a few months, we may find out if we’ve made a key breakthrough – or if it was just a flash in the pan.

Keep reading... Show less

Bird flu FAQ: What is avian influenza? How is it transmitted to humans? What are the symptoms? Are there effective treatments and vaccines? Will H5N1 become the next viral pandemic?

d

Avian influenza (“bird flu”) is a highly contagious viral infection that affects wild and domestic birds worldwide. It has recently gained notoriety for its devastating impact on the commercial poultry sector and as an emerging human public health threat.

Keep reading... Show less

A new psychology study has uncovered cultural differences in perceptions of heroes

In the field of social psychology, the study of heroes has attracted growing interest over the past decade, as heroes have been found to be an important part of everyday life and provide important psychological functions to children and adults. However, most research in this area has focused on predominantly WEIRD (white, educated, industrialized, rich, and from developed countries) samples and may not reflect wider conceptions of heroes across cultures. A recent study by my colleagues at the University of Limerick and myself delved into the cultural differences in lay perceptions of heroes, e...

Webb measures temperature of rocky exoplanet for first time

The James Webb Space Telescope has measured the temperature of a rocky exoplanet for the first time, finding that a "cousin" of Earth most likely lacks an atmosphere, researchers said Monday.

When the Trappist-1 system was discovered in 2017, astronomers were excited at the prospect that some of its seven rocky planets -- which are roughly similar to Earth in size and mass -- could be habitable.

Keep reading... Show less

Microplastic pollution impairs seabird gut health

Scientists have long known that wild seabirds ingest bits of plastic pollution as they feed, but a study Monday shows the tiny particles don't just clog or transit the stomach but can subvert its complex mix of good and bad bacteria too.

Plastic-infested digestive tracks from two species of Atlantic seabirds, northern fulmars and Cory's shearwaters, showed a decrease of mostly beneficial "indigenous" bacteria and more potentially harmful pathogens.

Keep reading... Show less

Scientists find water inside glass beads on the Moon

Scientists said Monday they have discovered water inside tiny beads of glass scattered across the Moon, suggesting that one day it could be extracted and used by the "explorers of tomorrow".

The Moon was long believed to be dry, but over the last few decades several missions have shown there is water both on the surface and trapped inside minerals.

Keep reading... Show less