NASA's Voyager 2 becomes second spacecraft to reach interstellar space
Washington: More than four decades after beginning its epic journey, NASA's Voyager 2 spacecraft has crossed the elusive boundary that marks the edge of the Sun's realm and the start of interstellar space, scientists have announced.
According to the researchers at the University of Iowa in the US, Voyager 2 has entered the interstellar medium (ISM), the region of space outside the bubble-shaped boundary produced by wind streaming outward from the Sun.
This makes Voyager 2 the second human-made object to journey out of the Sun's influence, following the US space agency's Voyager 1's solar exit in 2012.
The study, published in the journal Nature Astronomy, confirmed Voyager 2's passage on November 5, 2018, into the ISM by noting a definitive jump in plasma density detected by a plasma wave instrument on the spacecraft.
The marked increase in plasma density is evidence of Voyager 2 journeying from the hot, lower-density plasma characteristic of the solar wind to the cool, higher-density plasma of interstellar space, the researchers said.
It is also similar to the plasma density jump experienced by Voyager 1 when it crossed into interstellar space, they said.
"In a historical sense, the old idea that the solar wind will just be gradually whittled away as you go further into interstellar space is simply not true," said Professor Don Gurnett from the University of Iowa, and corresponding author on the study.
"We show with Voyager 2 -- and previously with Voyager 1 -- that there's a distinct boundary out there. It's just astonishing how fluids, including plasmas, form boundaries," Gurnett said.
Voyager 2's entry into the ISM occurred at 119.7 astronomical units (AU), or more than 11 billion miles from the Sun. Voyager 1 passed into the ISM at 122.6 AU.
The spacecraft were launched within weeks of each other by NASA in 1977, with different mission goals and trajectories through space. Yet they crossed into the ISM at basically the same distances from the Sun.
That gives valuable clues to the structure of the heliosphere -- the bubble, shaped much like a wind sock, created by the Sun's wind as it extends to the boundary of the solar system, the researchers said.
"It implies that the heliosphere is symmetric, at least at the two points where the Voyager spacecraft crossed," said Bill Kurth, University of Iowa research scientist and a co-author on the study.
"That says that these two points on the surface are almost at the same distance," Kurth said. "There's almost a spherical front to this. It's like a blunt bullet," Gurnett added.
Data from the instrument on Voyager 2 also gives additional clues to the thickness of the heliosheath, the outer region of the heliosphere and the point where the solar wind piles up against the approaching wind in interstellar space, which Gurnett likens to the effect of a snowplow on a city street.
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UK PM Keir Starmer takes ‘China matters’ message on first Beijing visit
London (PTI): “Like it or not, China matters to the UK,” is the message British Prime Minister Keir Starmer is taking on his visit to Beijing on Wednesday, accompanied by a 60-strong business and cultural delegation.
Downing Street said the visit, which will also cover Shanghai, reflects the UK’s “clear-eyed and realistic” approach to China in terms of opportunities and challenges they pose by continuing to pursue cooperation while “maintaining guardrails” when it comes to the country’s national security.
The Labour Party government is keen to highlight its re-engagement with China with this first visit in eight years, coming close on the heels of a ministerial go-ahead for its controversial new “mega embassy” in London.
“For years, our approach to China has been dogged by inconsistency – blowing hot and cold, from Golden Age to Ice Age. But like it or not, China matters for the UK,” Starmer said in a pre-visit statement.
“As one of the world’s biggest economic players, a strategic and consistent relationship with them is firmly in our national interest. That does not mean turning a blind eye to the challenges they pose – but engaging even where we disagree.
“This is what our allies do, and what I will do: delivering for the public, putting more money in their pockets and keeping them safe through pragmatic, consistent cooperation abroad,” he said.
The UK PM is set to meet President Xi Jinping and Premier Li Qiang in Beijing on Thursday for talks on trade, investment and national security, before travelling to Shanghai for a range of engagements with British and Chinese businesses.
Accompanied by a delegation of leading UK-based businesses, including Tata Motors owned Jaguar Land Rover, sporting institutions, museums and theatre groups, Starmer is expected to push for access in areas such as the financial services sector, creative industries and life sciences.
“However, he will be clear that we will not trade economic cooperation for our national security. He will raise the areas where we disagree with China – being clear that we will always defend our national security and where viewpoints differ, frank and open dialogue is of vital importance,” Downing Street said.
Describing China as the world’s second largest economy, a crucial player in global supply chains and a growing military power, the UK said it is important to engage with its third-largest trading partner which supports 3,70,000 British jobs.
“We want to see trade flourish between us. From financial services to advanced manufacturing and the global energy transition, the UK’s strengths increasingly align with the rapidly evolving Chinese economy,” said Peter Kyle, the Business and Trade Secretary travelling with Starmer.
“The first duty of government is security, and we protect ourselves best through active engagement and pragmatic cooperation, not by shutting the door,” he said.
The visit follows the 2025 Economic and Financial Dialogue (EFD) that the UK’s Department for Business and Trade (DBT) claimed secured 600 million pounds in immediate benefits and the first UK-China Joint Economic and Trade Commission (JETCO) since 2018.
“The UK’s world-leading financial services sector is a cornerstone of our economy. With deep and liquid markets, and the FTSE hitting all-time highs, there are real opportunities for mutually beneficial cooperation with China which supports jobs for working people and growth for businesses across Britain,” said Lucy Rigby, Economic Secretary to the Treasury, also part of the ministerial delegation.
The Opposition Conservatives have criticised Starmer’s approach to China, amid human rights concerns and espionage fears. “Starmer has already surrendered to the Chinese Communist Party over their plan for a spy-hub super embassy in the heart of our capital,” said shadow foreign secretary Priti Patel.
“The evidence is overwhelming that China poses a serious threat to our national security and it is clear Starmer is going to China without any leverage. He lacks the backbone to stand up for Britain and is bending over backwards to appease Beijing,” she said.
Following his trip to China, Starmer is set to travel to Tokyo to meet with Japanese Prime Minister Sanae Takaichi to reinforce the UK-Japan partnership, said to be worth over 100 billion pounds and supporting 2,00,000 UK jobs.
