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A spacecraft has been launched from California this morning carrying with it humanity’s greatest hopes of being able to protect our planet from a cataclysmic asteroid impact.

Fortunately the DART (Double Asteroid Redirection Test) mission is only a test, and if anything goes wrong before it intercepts its target next September, then Earth won’t suffer as a result.

But the stakes are high. Scientists including Stephen Hawking have described impact events as among the greatest threats facing humanity – and even if the DART planetary defence mission proves successful, huge questions about our future readiness will remain.

The DART spacecraft's collision will be observed by the LICIACube satellite
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The DART spacecraft’s collision will be observed by the LICIACube satellite. Pic: NASA

DART launched on top of a SpaceX Falcon 9 rocket at the Vandenberg Space Force base in California.

Roughly the size of a small car, the spacecraft has been developed by NASA and the Johns Hopkins Applied Physics Laboratory to demonstrate for the first time the “kinetic impactor technology” using a direct hit on an asteroid to adjust its speed and path.

A small LICIACube satellite developed by the Italian space agency will travel alongside it to observe the collision which will take place when DART and its target asteroid are within 11 million kilometres of Earth, enabling ground-based telescopes to measure the impact too.

DART is targeting a near-Earth double asteroid known as Didymos and Dimorphos, with the latter being a “moonlet” estimated to be about 160 metres in size – a good test object, but not one that is actually expected to collide with Earth.

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It will hit Dimorphos at a speed of roughly 6.6 kilometres per second and, in doing so, shorten its orbit about Didymos – proving that a kinetic impact can change an asteroid’s trajectory.

This nudge technique is preferred to blowing asteroids apart in the style of the film Armageddon, because the fragments from such an explosion could continue to imperil the planet.

A study from researchers at Johns Hopkins University in the US published in 2019 warned that for objects large enough to be targeted it was likely the blasted away fragments would reform under gravity.

Illustration of the DART spacecraft with the Roll Out Solar Arrays extended. Image credit: NASA
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The DART spacecraft is just the size of a small car, not including its solar arrays. Pic: NASA

How important is the mission?

The good news is that scientists are completely confident that no asteroids larger than 1km will strike our planet within the next century – the maximum period we can see map out their movements for due to the unpredictability of dynamic systems.

What’s also good is that even among much smaller asteroids, ones larger than just 140 metres, there are no known objects that have a significant chance of striking Earth within the next 100 years too.

The bad news is that only 40% of these asteroids have been found, and the worse news is that asteroids can be much smaller than 140m and still cause significant damage to regions or cities.

Humanity’s ability to detect asteroids before they impact the planet is still in its infancy, in part because of limits set by the laws of physics – our ability to survey asteroids in the dark of space in our solar system depends on them reflecting light towards us, and that depends on direction of their approach relative to the sun and the phase of the moon.

There have been more than 1,200 impacts of asteroids larger than a metre in size since 1998 and of those impacts humanity has only predicted five in advance – 0.42% – and even those predictions came with just hours to spare.

This timeline offers much less wriggle-room than the five years between the DART mission getting approval at NASA and its scheduled rendezvous with Dimorphos next year.

Never mind deflecting an asteroid off-course, hours wouldn’t even offer enough time to evacuate a town.

But astronomers hope and expect that new technologies and monitoring systems will improve our ability to make these predictions in the future – giving us more time – and the DART mission is just the first step in us proving that there is something we can do about it when we know something is coming.

This video grab from YouTube footage shows a meteor streaking across the sky in the Chelyabinsk region of central Russia.
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This video grab from YouTube footage shows the meteor streaking across the sky in the Chelyabinsk

What damage can impact events cause?

Impact events are believed to have radically reshaped our planet throughout history, from the formation of the moon through to several enormous extinction events.

The Chicxulub crater is believed to have been caused by a large asteroid approximately 10km in diameter striking the Earth just over 66 million years ago, leading a very sudden mass extinction of an estimated 75% of all animal and plant life on the planet – including the dinosaurs.

A similar scale impact is not expected for the next 100 years at least, but significant damage could be caused by smaller asteroids.

Back in 2013, a meteor exploded in the atmosphere near Chelyabinsk in Russia, causing an enormous fireball, shattering windows, and leading to potentially more than a thousand people to seek medical treatment for their indirect injuries.

The SpaceX Falcon 9 rocket with the Double Asteroid Redirection Test, or DART, spacecraft onboard, is seen ready for launch, Tuesday, Nov. 23, 2021, at Space Launch Complex 4E, Vandenberg Space Force Base in California. DART is the world...s first full-scale planetary defense test, demonstrating one method of asteroid deflection technology. The mission was built and is managed by Johns Hopkins APL for NASA...s Planetary Defense Coordination Office. Photo Credit: (NASA/Bill Ingalls)
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The SpaceX Falcon 9 rocket with the Double Asteroid Redirection Test (DART) spacecraft onboard ahead of launch. Pic: NASA/AP

That asteroid is believed to have been roughly 20 metres in size and was completely undetected before it entered the atmosphere, in part because it approached Earth from the direction of the sun – meaning it reflected no light to telescopes on Earth revealing its approach.

When it burned up in the atmosphere and exploded it briefly outshone the sun and the heat from the blast inflicted severe burns on observers below, as well as smashing windows and rattling buildings.

According to Johns Hopkins Applied Physics Laboratory, the Chelyabinsk meteor created “an airburst and shockwave that struck six cities across the country - and [sent] a stark reminder that dangerous objects can enter Earth’s atmosphere at any time”.

“Astronomers estimate there are tens of thousands of near-Earth asteroids close to 500ft (150m) wide and larger, big enough to cause regional devastation if they actually hit Earth.

“The Chelyabinsk object was just about 60ft (18m) wide, demonstrating that even small asteroids can be of concern - and making real-world tests of space-based planetary defence systems all the more important,” the university added.

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Why US may soon have a real energy emergency

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Why US may soon have a real energy emergency

Donald Trump declared a questionable “national energy emergency” when he entered the White House. Soon, he may have one for real.

The president promised his America would “drill, baby drill” to new levels of prosperity by making the most of its reserves of oil and gas.

Mr Trump has now axed hundreds of billions in tax breaks and grants for low-carbon power and clean energy research and given them instead to fossil fuel investments.

Construction continues on Revolution Wind but the project is not yet connected to the grid. Pic: Reuters
Image:
Construction continues on Revolution Wind but the project is not yet connected to the grid. Pic: Reuters

There’s no better example than Revolution Wind, one of the largest offshore renewable energy projects in America.

Nearly 80% complete, the White House ordered an immediate halt.

When we visited, the massive 200m-wide turbines were going round – a temporary injunction has allowed construction to continue – but they’re not yet connected to the grid.

As long as Mr Trump is in power, it’s not certain they’ll ever be.

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The future of other major wind and solar developments is also in doubt, as is more than $100bn (£75bn) in clean energy investment.

There’s less doubt about the fossil fuel business however. The industry is getting what it asked for after backing Mr Trump’s re-election.

US energy secretary Chris Wright and many key White House staff and advisers are former fossil fuel industry insiders.

Analysis for Sky News, by Global Witness, reveals that since the Paris Agreement was signed in 2015, US oil and gas production has grown five times faster than the average of the world’s next largest producers.

An increase that really took off during Mr Trump’s first presidency.

The analysis of company data goes on to reveal how US oil and gas production is now forecast to continue growing – by 2035 to double that of its next closest rival, Russia.

“Instead of reducing investment in dirty oil and gas, the principal drivers of climate breakdown, the US has doubled down on fossil fuels, ramping up production,” said Patrick Galey, of Global Witness.

A fact that would probably be music to the president’s ears and to many conservative Americans who voted for him.

US oil and gas production is forecast to grow to double that of Russia's by 2035
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US oil and gas production is forecast to grow to double that of Russia’s by 2035

Mr Trump’s “energy emergency” was perhaps a predictable response to the “climate emergency” invoked by his political rivals.

The only problem is, apart from accelerating global warming, his energy plan is on course to make America worse off.

‘US energy demand to grow 25%’

For the first time in years, US electricity demand has been going up. It is driven in part by a race to build power-hungry data centres – further encouraged by Mr Trump’s aim for American supremacy in AI.

Demand is rising and renewable energy is the quickest, cheapest way to meet it.

Data centres require vast amounts of power. Pic: Reuters
Image:
Data centres require vast amounts of power. Pic: Reuters

President Trump has championed supremacy in AI – backing investments in and clearing red tape for massive energy-hungry data centres.

After declining, then remaining stable for years, US energy demand is now forecast to grow 25% by 2030, according to analysis by ICF International.

But where will all the electricity come from?

We went to Mitsubishi Power, which makes state-of- the-art gas turbines for power stations at its factory outside Savannah, Georgia.

Demand for new turbines has never been greater, according to Bill Newsom, the US CEO. Wait times for new turbines is now double what it was just two years ago.

Mitsubishi makes gas turbines for power stations at its factory outside Savannah, Georgia
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Mitsubishi makes gas turbines for power stations at its factory outside Savannah, Georgia

And while America will need gas to meet rising demand – it’s twice as clean as coal and provides “baseload” power that renewable energy grids can’t yet match – it can’t be built fast enough.

American businesses, including AI, will likely suffer because they can’t get the power they need.

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US consumers – who Mr Trump promised lower bills – will end up paying more because he also made renewable energy more expensive.

And that’s to say nothing of the impact on carbon emissions.

The speed of transition being called for to meet the 1.5C Paris target was always going to be very expensive, as countries like the UK are finding out.

But by fighting one “emergency” with another, Mr Trump risks making Americans – and the climate – worse off.

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One year on from Donald Trump’s election win, an untold story has emerged

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One year on from Donald Trump's election win, an untold story has emerged

It’s a year since the US put Donald Trump back in the White House and I’ve spent this anniversary week in Florida and in Pennsylvania – two worlds in one country where I found two such contrasting snapshots of Trump’s America.

There are many ways to reflect on the successes and failures of the past year. Different issues matter to different people. But the thing which matters to all Americans is money.

The cost of living was a key factor in Donald Trump’s victory. He promised to make the country more affordable again. So: how’s he done?

On Wednesday, exactly a year since Americans went to the polls, the president was in Miami. He had picked this city and a particular crowd for his anniversary speech.

I was in the audience at the America Business Forum as he told wealthy entrepreneurs and investors how great life is now.

“One year ago we were a dead country, now we’re considered the hottest country in the world.” he told them to cheers. “Record high, record high, record high…”

The vibe was glitzy and wealthy. These days, these are his voters; his crowd.

“After just one year since that glorious election, I’m thrilled to say that America is back, America is back bigger, better, stronger than ever.” he said.

“We’ve done really well. I think it’s the best nine months, they say, of any president. And I really believe that if we can have a few more nine months like this, you’d be very happy. You’d be very satisfied.”

There was little question here that people are happy.

Liz Ciborowski says Trump has been good for the economy
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Liz Ciborowski says Trump has been good for the economy

“Trump’s been a good thing?” I asked one attendee, Liz Ciborowski.

“Yes. He has really pushed for a lot of issues that are really important for our economy,” she said.

“I’m an investor,” said another, Andrea.

“I’m a happy girl. I’m doing good,” she said with a laugh.

Andrea says she's happy with how the economy is faring
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Andrea says she’s happy with how the economy is faring

A year on from his historic victory, the president was, notably, not with the grassroots folk in the places that propelled him back to the White House.

He had chosen to be among business leaders in Miami. Safe crowd, safe state, safe space.

But there was just one hint in his speech which seemed to acknowledge the reality that should be a concern for him.

“We have the greatest economy right now,” he said, adding: “A lot of people don’t see that.”

That is the crux of it: many people beyond the fortunate here don’t feel the “greatest economy” he talks about. And many of those people are in the places that delivered Trump his victory.

That’s the untold story of the past year.

A thousand miles to the north of Miami is another America – another world.

Steelton, Pennsylvania sits in one of Donald Trump’s heartlands. But it is not feeling the beat of his greatest economy. Not at all.

At the local steel union, I was invited to attend a meeting of a group of steel workers. It was an intimate glimpse into a hard, life-changing moment for the men.

The steel plant is shutting down and they were listening to their union representative explaining what happens next.

David Myers used to be employed at the steelworks
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David Myers used to be employed at the steelworks

The conversation was punctuated with all the words no one wants to hear: laid off, severance, redundancy.

“For over 100 years, my family has been here working. And I was planning on possibly one day having my son join me, but I don’t know if that’s a possibility now,” former employee David Myers tells me.

“And…” he pauses. “Sorry I’m getting a little emotional about it. We’ve been supplying America with railroad tracks for over a century and a half, and it feels weird for it to be coming to an end.”

Cleveland Cliffs Steelton plant is closing because of weakening demand, according to its owners. Their stock price has since surged. Good news for the Miami crowd, probably. It is the irony between the two Americas.

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Steelton in Pennsylvania
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Steelton in Pennsylvania

Down at the shuttered plant, it’s empty, eerie and depressing. It is certainly not the image or the vision that Donald Trump imagined for his America.

Pennsylvania, remember, was key to propelling Trump back to the White House. In this swing state, they swung to his promises – factories reopened and life more affordable.

Up the road, conversations outside the town’s government-subsidised homes frame the challenges here so starkly.

“How much help does the community need?” I asked a man running the local food bank.

Elder Melvin Watts is a community organiser
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Elder Melvin Watts is a community organiser

“As much as they can get. I mean, help is a four-letter word but it has a big meaning. So help!” community organiser Elder Melvin Watts said.

I asked if he thought things were worse than a year ago.

“Yes sir. I believe they needed it then and they need it that much more now. You know it’s not hard to figure that out. The cost of living is high.”

Nearby, I met a woman called Sandra.

Sandra says it's getting harder to make ends meet
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Sandra says it’s getting harder to make ends meet

“It’s been harder, and I’m a hard-working woman.” she told me. “I don’t get no food stamps, I don’t get none of that. You’ve got to take care of them bills, eat a little bit or don’t have the lights on. Then you have people like Mr Melvin, he’s been out here for years, serving the community.”

Inside Mr Melvin’s food bank, a moment then unfolded that cut to the heart of the need here.

A woman called Geraldine Santiago arrived, distressed, emotional and then overwhelmed by the boxes of food available to her.

“We’ll help you…” Mr Melvin said as she sobbed.

Geraldine's welfare has been affected by the shutdown
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Geraldine’s welfare has been affected by the shutdown

Geraldine is one of 40 million Americans now not receiving the full nutritional assistance programme, known as SNAP, and usually provided by the federal government.

SNAP benefits have stopped because the government remains shut down amid political deadlock.

I watched Geraldine’s rollercoaster emotions spilling out – from desperation to gratitude at this moment of respite. She left with a car boot full of food.

A year on from his victory, Donald Trump continues to frame himself as the “America First” president and now with an economy transformed. But parts of America feel far, far away.

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Nancy Pelosi, the first woman in Speaker’s office, to stand down after 40 years in US Congress

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Nancy Pelosi, the first woman in Speaker's office, to stand down after 40 years in US Congress

Nancy Pelosi, the first woman in the Speaker’s office, has announced her retirement from American politics after a nearly 40-year career.

The 85-year-old, who has represented San Francisco since 1987, revealed her decision two days after Californian voters overwhelmingly approved “Proposition 50”, a state redistricting effort aimed at flipping five House seats to Democrats in the midterm elections next year.

“I will not be seeking re-election to Congress,” Pelosi said in a video address to voters.

“With a grateful heart, I look forward to my final year of service as your proud representative.

“My message to the city I love is this: San Francisco, know your power,” she said. “We have made history. We have made progress. We have always led the way.”

“And now we must continue to do so by remaining full participants in our democracy and fighting for the American ideals we hold dear.”

Nancy Pelosi at the Democratic National Convention in 2024.  Pic: Reuters
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Nancy Pelosi at the Democratic National Convention in 2024. Pic: Reuters

Mrs Pelosi served as the 52nd Speaker of the House of Representatives from 2007 to 2011, and again from 2019 to 2023, and was the first woman elected to the role.

She was also the first woman to lead a major political party in either chamber of Congress, heading the House Democrats from 2003 to 2023.

During her second tenure as Speaker, the House twice impeached Donald Trump – in December 2019, and January 2021 – though the Senate acquitted him both times.

And in February 2020, during President Trump’s State of the Union address, she famously tore up her official copy of it, arguing “it was such a dirty speech”.

An architect of the Affordable Care Act, Mrs Pelosi has also been credited with quietly persuading Joe Biden to withdraw from the 2024 presidential race.

End of an era

Nancy Pelosi was a central figure during two of the most turbulent political periods – the Trump presidency and President Biden’s departure from the 2024 election.

During the Trump era, she emerged as the Democratic Party’s most visible counterweight to the administration.

She led the House through two impeachments and became was prime target for those who stormed the Capitol Building on January 6th 2021.

In 2024, her behind-the-scenes influence was decisive as Democrats confronted Joe Biden’s declining political position.

While careful in her public statements, her subtle signalling to leaders and donors accelerated his departure from the race.

From a wider perspective, her retirement marks the end of one of the most influential congressional careers in modern US politics.

As the first woman Speaker of the House, she shaped legislative priorities for two decades and her departure signals a generational shift within the Democratic Party.

Now her political contemporaries have paid tribute.

Former President Joe Biden said America “will always be grateful” to her.

He posted on X: “I often said Nancy Pelosi was the best Speaker of the House in American history – it’s why I awarded her the Presidential Medal of Freedom.

“When I was President, we worked together to grow our economy, create millions of jobs, and make historic investments in our nation’s future.”

California’s Democrat Governor Gavin Newsom, said she “inspired generations” and “set the standard for what public service should be”.

While party colleague, Senator Adam Schiff, who also represents California, called her “the greatest Speaker in American history” and highlighted her “tenacity, intellect, strategic acumen and fierce advocacy”.

And Representative Don Beyer of Virginia, another Democrat, said she was “a major figure in American history”, a “barrier breaker”, and “one of our most brilliant and accomplished leaders”.

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“Why did you refuse the National Guard on January 6?”

First elected in 1987, she came into politics later in life, and has long resisted calls to step aside, turning questions about her future into spirited rebuttals.

But she’s faced new challenges in recent years and her decision to step down is not fully unexpected.

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Last year she fractured her hip when she fell during a European trip, and was rushed to a military hospital for surgery.

And in 2022, her husband Paul Pelosi was gravely injured by a home intruder who beat him over the head with a hammer and demanded to know “Where is Nancy?”

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Nonetheless, she’s maintained a rigorous political schedule of public events and party fundraisers.

Now eyes will turn to the question of her successor, both at home in San Francisco, and in the US Congress where she plays a behind-the-scenes leadership role.

She’s already faced a potential primary challenge from Saikat Chakrabarti, a left-wing newcomer who played a part in the rise of Alexandria Ocasio-Cortez – another rising star in the progressive firmament.

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