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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Cong takes swipe at PM over India not being part of US-led 'Pax Silica' grouping
New Delh (PTI) The Congress on Saturday said it is perhaps not very surprising that India is not part of a US-led strategic initiative to build a secure silicon supply chain, given the "sharp downturn" in the Trump-Modi ties, and asserted that it would have been to "our advantage if we had been part of this group".
Congress general secretary in charge of communications Jairam Ramesh took a swipe at Prime Minister Narendra Modi, saying the news of India not being part of the group comes after the PM had enthusiastically posted on social media about a telephone call with his "once-upon-a-time good friend and a recipient of many hugs in Ahmedabad, Houston, and Washington DC".
In a lengthy post on X, Ramesh said, "According to some news reports, the US has excluded India from a nine-nation initiative it has launched to reduce Chinese control on high-tech supply chains. The agreement is called Pax Silica, clearly as a counter to Pax Sinica. The nations included (for the moment at least) are the US, Japan, the Republic of Korea, Singapore, the Netherlands, the United Kingdom, Israel, the United Arab Emirates, and Australia."
"Given the sharp downturn in the Trump-Modi ties since May 10th, 2025, it is perhaps not very surprising that India has not been included. Undoubtedly, it would have been to our advantage if we had been part of this group."
"This news comes a day after the PM had enthusiastically posted on his telephone call with his once-upon-a-time good friend and a recipient of many hugs in Ahmedabad, Houston, and Washington DC," the Congress leader asserted.
The new US-led strategic initiative, rooted in deep cooperation with trusted allies, has been launched to build a secure and innovation-driven silicon supply chain.
According to the US State Department, the initiative called 'Pax Silica' aims to reduce coercive dependencies, protect the materials and capabilities foundational to artificial intelligence (AI), and ensure aligned nations can develop and deploy transformative technologies at scale.
The initiative includes Japan, South Korea, Singapore, the Netherlands, the United Kingdom, Israel, the United Arab Emirates, and Australia. With the exception of India, all other QUAD countries -- Japan, Australia and the US -- are part of the new initiative.
New Delhi will host the India-AI Impact Summit 2026 on February 19-20, focusing on the principles of 'People, Planet, and Progress'. The summit, announced by Prime Minister Narendra Modi at the France AI Action Summit, will be the first-ever global AI summit hosted in the Global South.
Prime Minister Modi and US President Trump on Thursday discussed ways to sustain momentum in the bilateral economic partnership in a phone conversation amid signs of the two sides inching closer to firming up a much-awaited trade deal.
The phone call between the two leaders came on a day Indian and American negotiators concluded two-day talks on the proposed bilateral trade agreement that is expected to provide relief to India from the Trump administration's whopping 50 per cent tariffs on Indian goods.
In a social media post, Modi had described the conversation as "warm and engaging".
"We reviewed the progress in our bilateral relations and discussed regional and international developments. India and the US will continue to work together for global peace, stability and prosperity," Modi had said without making any reference to trade ties.
