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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Karnataka Milk Federation enters Delhi-NCR, offers competitive pricing on Nandini products
New Delhi, Nov 21: Karnataka Chief Minister Siddaramaiah on Thursday launched the Karnataka Milk Federation's (KMF) Nandini brand milk products in the Delhi-NCR market, pricing them marginally lower than competitors to gain a foothold in the region.
The cooperative will retail four cow milk variants, curd, and buttermilk from Friday, with competitive pricing that undercuts established players like Mother Dairy and Amul.
Cow milk will be sold at Rs 56 per litre, full Cream Milk at Rs 67 per litre, Standardised Milk at Rs 61 per litre, Toned Milk at Rs 55 per litre, and curd at Rs 74 per kg.
"We have surplus milk in the state. KMF along with Mandya Milk Union will market surplus milk of 3-4 lakh litres per day in Delhi-NCR," Siddaramaiah told reporters after launching the products.
The federation currently collects 100 lakh litres of milk daily, with local consumption at 60 lakh litres, leaving a surplus of 40 lakh litres for expansion into new markets.
However, the Chief Minister acknowledged the challenges of transporting milk over 2,500 km, which takes 50-54 hours.
There is a need to find new markets for surplus milk and gradually the KMF should be able to sell 5-6 lakh litres per day in Delhi-NCR, he added.
KMF Chairman LBP Bheemanaik assured that milk quality would be maintained during transit.
The federation has already partnered with 40 dealers in the Delhi-NCR region to facilitate sales, he added.
With a robust infrastructure of 26.76 lakh milk producers, 15,737 dairy cooperative societies, and 15 district milk unions, KMF has a turnover of Rs 25,000 crore and exports dairy products to over 25 countries.
State Animal Husbandry Minister K Venkatesh and Agriculture Minister N Cheluvarayaswamy were present at the product launch.
ದೇಶದ ಹಾಲು ಉತ್ಪಾದನೆಯಲ್ಲಿ ಗುಜರಾತ್ ಮೊದಲ ಸ್ಥಾನದಲ್ಲಿದ್ದರೆ, ಕರ್ನಾಟಕ ಎರಡನೇ ಸ್ಥಾನದಲ್ಲಿದೆ.
— Siddaramaiah (@siddaramaiah) November 21, 2024
ದೆಹಲಿ ನಗರದಲ್ಲಿ ಕೆ.ಎಂ.ಎಫ್ ಮತ್ತು ಮಂಡ್ಯ ಹಾಲು ಒಕ್ಕೂಟಗಳು ಸೇರಿಕೊಂಡು ವಿವಿಧ ಶ್ರೇಣಿಯ ಹಾಲನ್ನು ಮಾರುಕಟ್ಟೆಗೆ ಬಿಡುಗಡೆ ಮಾಡಿವೆ. ದೆಹಲಿಯ ನಿವಾಸಿಗಳಿಂದ ನಂದಿನಿ ಉತ್ಪನ್ನಗಳಿಗೆ ಅತ್ಯುತ್ತಮ ಸ್ಪಂದನೆ ದೊರೆಯಲಿದೆ ಎಂಬ ವಿಶ್ವಾಸ ನನಗಿದೆ.… pic.twitter.com/yUmTQknGzD
