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A selection of Einstein rings that were photographed by the Hubble space telescope. (These rings have not been duplicated like the ones from the new study.) (Image credit: NASA)

Researchers may be one step closer to uncovering the true identity of dark matter after studying how light gets bent out of shape in weirdly warped Einstein rings and other gravitationally lensed objects.

Researchers estimate that dark matter makes up around 85% of the universe. But although experts have observed the gravitational effects of dark matter and mapped out where it could be, scientists still have no idea what it really is. This confusion is caused by the fact that dark matter does not emit light or any other form of electromagnetic radiation like ordinary, or baryonic, matter.

Since dark matter was first theorized in the late 19th century, scientists have made lots of suggestions about what dark matter could really be. However, the scientific community currently recognizes two hypothetical candidates as the most likely culprits: weakly interacting massive particles (WIMPs), which are predicted to behave much like other like particles; and axions, which are minute particles that likely behave like waves due to quantum interference. But despite years of experiments in particle accelerators, neither WIMPs nor axions have been discovered.

In a new study, published April 20 in the journal Nature Astronomy (opens in new tab) , researchers attempted to find out which dark matter candidate was most likely by analyzing several unusual gravitationally lensed objects — extremely far-away objects that are magnified when light they emit travels through gravitationally warped space-time surrounding a closer object. Image 1 of 2A near-perfect Einstein ring from the galaxy JO418 captured by the James Webb Space Telescope. (This Einstein ring was not part of the new study.) (Image credit: Spaceguy44) A close up of the JO418 Einstein ring. (Image credit: Spaceguy44)

Normally, gravitational lensing causes light from a distant object, like a galaxy or quasar, to appear to bend around a closer, equally massive object that is positioned between the distant object and an observer. The enormous mass of the foreground object, which can be a galaxy, quasar or black hole, creates an intense gravitational force that bends space-time around it; so rather than light bending around the foreground object, the light travels in a straight line through curved space-time. The result is a partial or complete ring of magnified light visible to the observer, which enables scientists to study the distant object in greater detail than is normally possible. 

When the ring of light surrounding the foreground object forms a perfect, or close-to perfect, circle, it is known as an Einstein ring after Albert Einstein, who first predicted this phenomenon in 1912. In august 2022, the James Webb Space Telescope captured a stunning image of one of the most perfect Einstein rings ever seen.

However, some Einstein rings, as well as other non-ring lensed objects, can appear duplicated, where multiple images of the same lensed object are visible. Scientists believe these oddballs are created when space-time is further bent out of shape by “dark matter halos” — hypothetical rings of dark matter that surround certain galaxies but have never been directly detected.

“By studying how the rings or other lensed images are distorted, astronomers can learn about the properties of the dark matter halo surrounding the closer [foreground] galaxy,” Rossana Ruggeri (opens in new tab) , a cosmologist at the University of Queensland who was not involved with the study, wrote in an article about the study in The Conversation (opens in new tab) . 

A distorted image of the quadruply lensed quasar HS 0810+2554. The multiple lights in the image are copies of the same lightsource. (Image credit: Hubble Space Telescope / NASA / ESA)

To do this, the researchers analyzed images of several oddly lensed objects, with a particular focus on HS 0810+2554, a quadruply lensed quasar that was first discovered in 2002 (opens in new tab) . They then compared these images with two computer simulations — one in which the halo was made predominantly of particles, like WIMPs, and another where the halo had more wave-like characteristics, like axions. The team discovered that for every object, the images most closely matched the axion model. RELATED STORIES—Astronomers spot dark matter creating eerie clones of a distant galaxy

—Quantum crystal could reveal the identity of dark matter

—Large Hadron Collider switches on at highest ever power level to look for dark matter 

“The result suggests axions are a more probable candidate for dark matter,” Ruggeri said, which has left some scientists “buzzing with excitement.” However, the debate is still far from settled, and follow-up studies are required to prove this theory, she added.

Axions and WIMPs aren’t the only possible candidates for dark matter. Past research suggested that the invisible matter could also consist of neutrinos, gravitons or tiny black holes (also known as “Fermi balls”). Even more far-out studies suggest that dark matter could actually be made of dark matter interacting with itself in unknown extra dimensions. 

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UK and US have ‘balanced’ trading relationship after Trump tariff threat, No 10 says

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UK and US have 'balanced' trading relationship after Trump tariff threat, No 10 says

The UK and the US have a “fair and balanced trading relationship”, Number 10 has said, after Donald Trump claimed the UK is “out of line”.

The American president suggested he is ready to impose tariffs on both the UK and the EU after he announced 25% tariffs on goods from Mexico and Canada, and 10% on China.

The FTSE 100 index of leading UK shares fell sharply on Monday morning after Mr Trump was asked if he will slap levies on Britain too.

He replied: “UK is out of line but I’m sure that one… I think that one can be worked out.”

Politics latest: Starmer meeting EU leaders in post-Brexit milestone

Reacting to that comment, a UK government spokesman said: “The US is an indispensable ally and one of our closest trading partners, and we have a fair and balanced trading relationship which benefits both sides of the Atlantic.

“We look forward to working closely with President Trump to continue to build on UK-US trading relations for our economy, businesses and the British people.”

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The US represents 18% (£300bn) of the UK’s trade and the countries are each other’s single largest investors with £1.2trn invested in each other’s economies.

Read more:
How Trump’s tariffs could impact US consumers and UK
Breaking economies could be first step for expansionist Trump

Canada and Mexico hit back with retaliatory tariffs

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Why PM’s EU meeting is a big deal

Mr Trump’s comments and the subsequent market fallout, also seen in Europe, are set to overshadow Sir Keir Starmer becoming the first UK leader to meet all 27 EU chiefs since Brexit.

UK ministers have previously suggested the country could avoid US tariffs as it does not have a trade deficit with Britain.

Despite his threat, Mr Trump had positive words for the UK when he said discussions with the prime minister have “been very nice”.

“We’ve had a couple of meetings. We’ve had numerous phone calls. We’re getting along very well,” he said.

However, he said tariffs will “definitely” be placed on goods from the EU as he said America’s trade deficit with the bloc is “an atrocity” and “they take almost nothing and we take everything from them”.

Following Mr Trump revealing levies on Canada, Mexico and China, but before his UK and EU tariff comments, Sir Keir said: “It is early days. What I want to see is strong trading relations.

“In the discussions that I have had with President Trump, that is what we have centred on – a strong trading relationship.”

Canada, Mexico and China have all vowed to slap tariffs on US goods, sparking fears of a global trade war.

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World

Migrant crossings: Why are more people crossing the Channel on the weekend?

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Migrant crossings: Why are more people crossing the Channel on the weekend?

More people are crossing the English Channel in small boats on the weekend. Our data analysis shows last year 40% of the total number of arrivals happened on a Saturday or Sunday.

We have been looking into possible reasons why many more people are arriving in small boats on the weekend, and the explanation might not be quite what you expect.

More people are crossing the channel in small boats on the weekend.
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More people are crossing the Channel in small boats on the weekend

Here are a few theories.

French staffing and resources

One suggestion is that French border force, police and coastguard are not working to a consistent level seven days a week.

“Gangs have realised there are lower or less engaged staffing on weekends on the French side,” a former senior Home Office official who worked closely on deals with the French told Sky News.

A former immigration minister said they found it “frustrating” that “we were paying the French but weren’t able to specify operational deployments”.

More on Migrant Crisis

They said it would “not surprise me if the French had fewer people at the weekend and the people smugglers have come to realise that”.

Hundreds of millions have been given by the UK to France to police the Calais coast, most recently almost £500m in 2023.

Another former senior government official with responsibility for borders said the French would be able to demonstrate that “hundreds or thousands of officers are working there” but “strategically it suits France to have the gust with us”.

But when we put this to the French side there was a pushback.

Marc de Fleurian, the Calais MP from Marine Le Pen’s National Rally party, says “blaming the other side of the Channel” is the “easy answer”.

He said it’s “cowardly to say it’s the other side’s fault”.

More people cross the Channel on the weekends than any other day.
Image:
More people cross the Channel on the weekends than any other day

Read more:
UK to introduce ‘world first’ sanctions regime to target smugglers
Can government make bold plan bite?
Starmer’s year to prove he can deliver on small boats

Pierre Henri Dumont, who was the Calais MP from 2017-2024, said: “The reality is you can have as many police officers as you want, but people will cross the Channel. If you have eight rather than 100 police officers that won’t change anything at all.”

A French coastguard source told Sky News there are the same staffing levels at the weekend, he says “any suggestion there is less staffing on the weekends is laughable and an easy thing to say”.

Sir Keir Starmer’s spokesman said the government’s work with the French saw “more than 28,000 dangerous unnecessary crossing attempts prevented last year”.

He added French law enforcing officers “routinely patrol beaches on weekends as well as during the week”.

Smuggler planning

Smuggler supply chains might be linked to a specific day for a range of reasons, for example, as one former senior Home Office official suggests, the fact “boat engines, or parts, might arrive on a Friday”.

Mr Dumont says smuggling networks rely on people to do small jobs, like transporting boats, who may also have day jobs in the week. He says the reasons behind the weekend uptick “are not necessarily predictable ones”.

A small inflatable dinghy crossing the English Channel from France to England in August 2024. Pic: Reuters
Image:
A small inflatable dinghy crossing the English Channel from France to England in August 2024. Pic: Reuters

Another factor may be that because French police tend not to intervene once a boat is in the water, many small boats set off from inland waterways. The canal-type waterways which come inland before the Channel are often full of fishing boats on weekdays, making it easier to launch from the waterways on weekends.

Another suggestion from a Home Office source is that while many migrants who cross the channel are based in the camps around Calais, many use public transport to arrive for a timed departure and are therefore reliant on transport timetables which may be more limited at different times of the week.

Weather coincidence

Leaked Home Office analysis shows that of the number of weekend days where small boat crossings were more likely because of good weather conditions was disproportionately high last year.

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The figures show that 61 out of 197 days where the weather meant there was a realistic possibility, likely or highly likely there would be a channel crossing were weekend days. However, we only have figures for 2024, and it seems unlikely the weather alone could account for three years of higher crossings on weekend days.

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Donald Trump’s tariffs: What’s going on and what does it all mean?

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Donald Trump's tariffs: What's going on and what does it all mean?

Donald Trump has ordered sweeping tariffs on Mexico, Canada and China, kicking off a trade war that will affect the globe.

Here we look at the tariffs and what they all mean for the world:

What did Trump announce?

The US president has confirmed that goods from Mexico and Canada will face 25% tariffs, while 10% taxes will be implemented on imports from China.

Canadian energy, including oil, natural gas and electricity, will be taxed at a 10% rate.

Trade war latest: Follow live updates

The levies are expected to all take effect on Tuesday, with Mexico and Canada both announcing counter-tariffs of their own in response.

Mr Trump has also threatened to go further, saying tariffs on the European Union would be implemented “pretty soon”.

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Trump’s proposed tariffs

When questioned about the UK, the president said Britain was “out of line” when it came to trade but he thought the situation could be “worked out” without the use of tariffs.

What are tariffs, and how do they work?

Put simply, tariffs are taxes on goods that are brought in from other countries.

By raising the price of imports, tariffs aim to protect domestic manufacturers by making locally made goods cheaper.

Contrary to what Mr Trump has said, it is not foreign countries that pay tariffs, but the importing companies that buy the goods.

For example, American businesses like Walmart or Target pay tariffs directly to the US treasury.

In the US, these tariffs are collected by customs and border protection agents, who are stationed at 328 ports of entry across the country.

Tariffs graphic
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Mr Trump’s proposed tariffs

To compensate for tariffs, companies then put up their prices, so customers end up paying more for goods.

Tariffs can also damage foreign countries as it makes their products pricier and harder to sell.

This can lead to them cutting prices (and sacrificing profits) to offset levies and maintain their market share in the US.

Why is Trump doing this?

Mr Trump has argued that imposing higher levies will help reduce illegal migration and the smuggling of the synthetic opioid fentanyl to the US.

On Mexico, the US leader claimed drug traffickers and the country’s government “have an intolerable alliance” that in turn impacts national security.

He further claimed that Mexican drug cartels are operating in Canada.

Tariffs graphic

On China, he said the country’s government provides a “safe haven” for criminal organisations.

He has also pledged to use tariffs to boost domestic manufacturing.

“We may have short term some little pain, and people understand that. But long term, the United States has been ripped off by virtually every country in the world,” he said.

His aim appears to be to force governments in those countries to work much harder to prevent what he calls illegal migration and the smuggling of the deadly drug fentanyl. But, even if the countries do not do what America wants, it will still potentially benefit firms that produce goods in the US.

What could the consequences be?

Mexico and Canada are two of America’s largest trading partners, with the tariffs upending decades-old trade relationships.

Goods that could be affected most by the incoming tariffs include fruit and veg, petrol and oil, cars and vehicle parts and electronic goods.

New analysis by the Budget Lab at Yale University found that the average US household would lose the equivalent of $1,170 US dollars (£944) in income from the tariffs.

Read more: This is how US consumers will be affected

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Why Trump’s tariffs could cost you

The research also found that economic growth would slow and inflation would worsen, as the tariffs forced up prices.

Immediate consequences were felt on Monday morning, as shares on Asian markets took a tumble.

Japan’s Nikkei opened down 2.9% while Australia’s benchmark – often a proxy trade for Chinese markets – fell 1.8%. Stocks in Hong Kong, which include listings of Chinese companies, fell 1.1%.

UK stocks were also significantly down, with the benchmark FTSE 100 index – containing the most valuable companies on the London Stock Exchange – dropped more than 1.3% on the open.

In Europe, stock markets opened sharply lower while the euro slid 1.3%. The Europe-wide index of companies, the Stoxx 600 dropped as much as 1.5%.

While Mexico’s peso hit its lowest in nearly three years.

‘Very scary path’

Sky News’ data and economics editor Ed Conway said the long term consequences of a trade war is that “everyone gets poorer”, which is what happened to the world before World War Two.

“As countries get poorer, they get frustrated and you get more nationalism,” Conway said, speaking on Friday’s Sky News Daily podcast.

“This is exactly what happened in the 1930s, and the world ended up at war with each other. It is a very, very scary path, and yes, we are basically on a potential of that path.”

However, Conway added that one positive of Mr Trump’s tariffs could be highlighting “massive imbalances” within the global economy.

He said Mr Trump may be able to shift the conversation to problems that “economists don’t want to talk about”.

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“At the moment, we have a dysfunctional global economy,” he explained.

“You have got massive imbalances like trade deficits [when a country’s imports exceeds the value of its exports] and trade surpluses [when a country’s exports exceeds the cost of its imports].

“There might well be a better way of everyone getting together and having a conversation and working out how to align their affairs, so we don’t have these imbalances in the future.

“And tariffs help to get you to this point.”

How has the world reacted?

Canadian Prime Minister Justin Trudeau reacted strongly against Mr Trump’s tariffs, saying his country would impose 25% tariffs on $155bn Canadian dollars (£85.9bn) of US goods in response.

He added that the move would split the two countries apart, and urged Canadians to choose domestic products rather than American ones.

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Tariffs against Canada ‘will put US jobs at risk’

Mexican President Claudia Sheinbaum posted on X to say she had ordered her economy minister to implement tariff and non-tariff measures to defend Mexico’s interests.

She said her government “categorically rejects” the claim that it has “alliances with criminal organisations” and called on the White House to “fight the sale of drugs on the streets of their major cities”.

Meanwhile, China has claimed the US action violates World Trade Organisation (WTO) rules, and vowed to bring a case before the body that governs global commerce.

It also threatened to take “necessary counter-measures to defend its legitimate rights and interests”.

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Mexico responds to Trump’s tariffs

A spokesperson for the UK government reiterated that the US is an “indispensable ally” and one of the country’s “closest trading partners”.

They added that the trading relationship was “fair and balanced”, after Mr Trump criticised the UK, saying it was “out of line”.

European Union (EU) leaders have also taken a strong stance against looming US tariffs.

Kaja Kallas, the chief of foreign policy for the bloc, said there were no winners in a trade war, and if the US and Europe started one “then the one laughing on the side is China”.

German Chancellor Olaf Scholz added that the EU is strong enough to “respond to tariffs with our own tariffs”, while French President Emmanuel Macron said declarations by the US were pushing Europe to be “stronger and more united”.

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EU can react with its own tariffs

What’s the history of trade wars?

Imposing tariffs is not new to Mr Trump, or the US for that matter.

During his first term in the White House, he imposed higher levies on China and Vietnam.

In 2018, he imposed 25% tariffs on imported steel and 10% on imported aluminium from most countries, a response to what he said was the unfair impact of Chinese steel driving down prices and negatively affecting the US steel industry.

China then hit back with retaliatory tariffs on US imports, including 15% on 120 American products such as fruits, nuts, wine and steel pipes and a 25% tariff on US pork and recycled aluminium.

Before that, democrat Jimmy Carter went so far as to completely ban the sale of wheat to Russia, which remained in effect until Ronald Reagan ended it in 1981.

Read more:
Breaking economies could be just Trump’s first step
Trump’s changed tack to focus on Mexico and Canada – why?
Toronto Raptors fans boo US national anthem

In 2019, Mr Trump also used the threat of tariffs as leverage to persuade Mexico to crack down on migrants crossing Mexican territory on their way to the US.

A study by economists at the Massachusetts Institute of Technology, the University of Zurich, Harvard and the World Bank concluded that Mr Trump’s tariffs the first time around failed to restore jobs to the American heartland.

The tariffs “neither raised nor lowered US employment” when they were supposed to protect jobs, according to Sky News’ US partner network NBC News.

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