NASA has successfully smashed a spacecraft into an asteroid seven million miles from Earth.
The last image from the “vending machine-sized” collider showed the surface of the asteroid Dimorphos seconds before impact.
The Double Asteroid Redirection Test (DART) is the first-ever trial of a “planetary defence system”.
If the orbit of an asteroid can be changed by an object sent into space, humanity may have a chance at protecting itself from the kind of disaster that did it for the dinosaurs.
NASA, and the international team of astronomers working with them, chose their target carefully. To prove success, they needed an asteroid they can carefully monitor following the collision. They also needed to make sure any impact wouldn’t send a previously harmless piece of rock spiralling towards Earth.
They picked a pair of asteroids: the 780 metre-wide Didymos, and its moon Dimorphos which is 160m wide – about the size of the Great Pyramid.
Image: DART approaches Dimorphos
Because Dimorphos is already safely orbiting its bigger partner, they can study the change in its behaviour following the collision.
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Dimorphos is also a fairly common size of asteroid. While significantly smaller than a kilometres-wide “planet killer”, it’s of a type easily big enough to destroy a city.
“What Dart is going up there to prove is that we actually do have a system for kinetic deflection, nudging these away and nudging them off course,” says Betsy Congdon, DART’s mechanical systems engineer at Johns Hopkins University in Maryland.
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If you’ve seen Hollywood disaster movies Deep Impact, Armageddon or more recently Don’t Look Up, prepare yourself for mild disappointment.
Despite smashing a half-tonne spacecraft into Dimorphos at close to 15,000 miles an hour, the effect on the asteroid is expected to be tiny – checking its speed by just 0.4mm per second.
But over time, that should have a measurable effect on its orbit. An array of land and space-based telescopes including NASA and ESA’s new James Webb Space Telescope, will all study the asteroid to measure the outcome of the test.
Image: An illustration of NASA’s DART spacecraft on a collision course with the asteroid Dimorphos. Pic: NASA/Johns Hopkins APL
Although it’s only a modest objective, the engineering involved was a major undertaking. Didymos is far too small and far away for DART to be steered into it from Earth. The probe had to use an autonomous guidance system to target the asteroid which is so small it was only visible in DART’s cameras about 50 minutes before impact. But the sat-nav seems to have worked perfectly.
The hope is, that a tiny nudge might be enough – if the impact is sufficiently far away – to deflect a future asteroid on collision course with Earth off target.
Astronomers estimate they have tracked the orbits of 95% of asteroids large enough to destroy life on Earth and none is currently on a collision course. But there are many smaller ones. According to NASA, no known asteroid larger than 140m across is likely to hit Earth in the next 100 years. But they think they’ve only found about 40% of them.
Image: The NASA team celebrates as DART impacts Dimorphos
Around 66 million years ago a 10km-wide asteroid slammed into what is now the Yucatan Peninsular of Mexico. It left a crater 110 miles wide and 12 miles deep. The resulting change in the planet’s climate is thought to have caused the Cretaceous-Paleogene extinction event. The impact wiped out 75% of animal and plant species on Earth – and famously ended the reign of flightless dinosaurs.
But even small space rocks can lead to a bad day on Earth. In 2013 a 20m-wide asteroid exploded as a meteorite over the city of Chelyabinsk in the Ural region of Russia. The blast was equivalent to 500 tonnes of TNT, about a third of the force of the Hiroshima bomb. While no deaths were reported there were more than 1,400 casualties, some of them serious.
“An asteroid impact is the one kind of natural disaster that we could potentially see coming decades away,” says Prof Colin Snodgrass at the University of Edinburgh is a member of the DART team.
He’s helped set up a telescope in Kenya to monitor the impact from Earth. “If one [the size of Dimorphos] was ever discovered coming towards earth being able to do something about that seems like a very sensible technology to have.”
Mature, developed economies like the UK and US became ever more reliant on cheap imports from China and, in the process, saw their manufacturing sectors shrink.
Large swathes of the rust belt in the US – and much of the Midlands and North of England – were hollowed out.
And to some extent that’s where the story of Donald Trump’s “Liberation Day” really began – with the notion that free trade and globalisation had a darker side, a side he wants to remedy via tariffs.
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Trump’s tariffs: Ed Conway analysis
He imposed a set of tariffs in his first term, some on China, some on specific materials like steel and aluminium. But the height and the breadth of those tariffs were as nothing compared with the ones we have just heard about.
Not since the 1930s has the US so radically increased the level of tariffs on all nations across the world. Back then, those tariffs exacerbated the Great Depression.
It’s anyone’s guess as to what the consequences of these ones will be. But there will be consequences.
Consequences for the nature of globalisation, consequences for the US economy (tariffs are exceptionally inflationary), consequences for geopolitics.
Image: Imports from the UK will face a 10% tariff, while EU goods will see 20% rates. Pic: Reuters
And to some extent, merely knowing that little bit more about the White House’s plans will deliver a bit of relief to financial markets, which have fretted for months about the imposition of tariffs. That uncertainty recently reached unprecedented levels.
But don’t for a moment assume that this saga is over. Nothing of the sort. In the coming days, we will learn more – more about the nuts and bolts of these policies, more about the retaliatory measures coming from other countries.
We will, possibly, get more of a sense about whether some countries – including the UK – will enjoy reprieves from the tariffs.
To paraphrase Churchill, this isn’t the end of the trade war, or even the beginning of the end – perhaps just the end of the beginning.
Actors, directors and celebrity friends have paid tribute to Val Kilmer, after he died aged 65.
The California-born star of Top Gun, Batman and Heat died of pneumonia on Tuesday night in Los Angeles, his daughter Mercedes told the Associated Press.
She said Kilmer was diagnosed with throat cancer in 2014 but later recovered.
Tributes flooded in after reports broke of the actor’s death, with No Country For Old Men star Josh Brolin among the first to share their memories.
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Watch: Val Kilmer in his most iconic roles
He wrote on Instagram: “See ya, pal. I’m going to miss you. You were a smart, challenging, brave, uber-creative firecracker. There’s not a lot left of those.
“I hope to see you up there in the heavens when I eventually get there. Until then, amazing memories, lovely thoughts.”
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Kyle Maclachlan, who co-starred with Kilmer in the 1991 biopic The Doors, wrote on social media: “You’ll always be my Jim. See you on the other side my friend.”
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Michael Mann, who directed Kilmer in 1995’s Heat, also paid tribute in a statement, saying: “I always marvelled at the range, the brilliant variability within the powerful current of Val’s possessing and expressing character.
“After so many years of Val battling disease and maintaining his spirit, this is tremendously sad news.”
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Heat co-star Danny Trejo also called Kilmer “a great actor, a wonderful person, and a dear friend of mine” on Instagram.
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Cher, who once dated the actor, said on X that “U Were Funny, crazy, pain in the ass, GREAT FRIEND… BRILLIANT as Mark Twain, BRAVE here during ur sickness”.
Lifelong friend and director of Twixt, Francis Ford Coppola said: “Val Kilmer was the most talented actor when in his High School, and that talent only grew greater throughout his life.
“He was a wonderful person to work with and a joy to know – I will always remember him.”
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The Top Gun account on X also said it was remembering Kilmer, who starred as Iceman in both the 1986 original and 2022 sequel, and “whose indelible cinematic mark spanned genres and generations”.
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Elon Musk has called reports that he will leave his government role in the coming months “fake news”.
A senior White House official previously told NBC News, Sky’s US partner network, that Donald Trump had discussed the Tesla and X boss transitioning back to the private sector at a cabinet meeting last month.
Image: The Tesla boss has headed DOGE since 20 January. File pic: Reuters
After reports emerged of the meeting, White House press secretary Karoline Leavitt said it was “garbage” and added: “Elon Musk and President Trump have both publicly stated that Elon will depart from public service as a special government employee when his incredible work at DOGE is complete.”
Mr Musk added in response on X: “Yeah, fake news.”
NBC News reported that the official said Mr Musk would leave at the end of his 130 days as a special government employee.
That would be 30 May, but it is unclear if the billionaire businessman will indeed leave on that date.
Previously, the White House said that as a temporary organisation, the Department of Government Efficiency (DOGE) would be terminated on 4 July next year – the 250th anniversary of the US.
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It comes days after Mr Musk said some members of his DOGE team were getting death threats on a daily basis.
Mr Muskhad drawn criticism over his efforts to downsize the US federal government.
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‘Elon Musk has got to go’
In just weeks, entire agencies were dismantled, and tens of thousands of workers from the 2.3 million federal workforce have been fired or have agreed to leave their jobs.
A number of lawsuits were filed in state and federal courts over cuts recommended by DOGE.