Stars' 'DNA' could help scientists find Sun's lost siblings
Sydney, April 18: With the aim to find the lost siblings of the Sun, now scattered across the sky, a team of astronomers has collected the "DNA" of more than 340,000 stars in the Milky Way.
The "DNA" can help trace the ancestry of stars, showing astronomers how the universe went from having only hydrogen and helium -- just after the Big Bang -- to being filled today with all the elements we have here on Earth that are necessary for life.
The research, detailed in the journal Monthly Notices of the Royal Astronomical Society, is based on the Galactic Archaeology survey, called GALAH, launched in late 2013 as part of a quest to uncover the formulation and evolution of galaxies.
When complete, GALAH will investigate more than a million stars.
The GALAH survey used the HERMES spectrograph at the Australian Astronomical Observatory's (AAO) 3.9-metre Anglo-Australian Telescope near Coonabarabran in New South Wales to collect spectra for the 340,000 stars.
"No other survey has been able to measure as many elements for as many stars as GALAH," said Gayandhi De Silva of the University of Sydney and AAO.
"This data will enable such discoveries as the original star clusters of the Galaxy, including the Sun's birth cluster and solar siblings -- there is no other dataset like this ever collected anywhere else in the world," De Silva said.
The Sun, like all stars, was born in a group or cluster of thousands of stars, explained Sarah Martell from the University of New South Wales (UNSW) Sydney who leads the GALAH survey observations.
"Every star in that cluster will have the same chemical composition, or DNA - these clusters are quickly pulled apart by our Milky Way Galaxy and are now scattered across the sky," Martell said.
"The GALAH team's aim is to make DNA matches between stars to find their long-lost sisters and brothers," she added.
For each star, this DNA is the amount they contain of each of nearly two dozen chemical elements such as oxygen, aluminium and iron.
Unfortunately, astronomers cannot collect the DNA of a star with a mouth swab but instead use the starlight, with a technique called spectroscopy.
The light from the star is collected by the telescope and then passed through an instrument called a spectrograph, which splits the light into detailed rainbows, or spectra.
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India, US trade team to start three-day talks from Dec 10: Sources
New Delhi (PTI): India and the United States will commence three-day talks on the first phase of their proposed bilateral trade agreement here from December 10, sources said.
The visit is crucial as India and the US are working to finalise the first tranche of the pact.
"The three-day talks will start on December 10. It will conclude on December 12, and it is not a formal round of talks," said one of the sources.
The US team will be led by Deputy United States Trade Representative (USTR) Rick Switzer.
This visit of the US officials marks their second trip since the imposition of a 25 per cent tariff and an additional 25 per cent penalty on Indian goods entering the American market due to the purchase of Russian crude oil.
On September 16, the US officials last visited India.
On September 22, Commerce and Industry Minister Piyush Goyal also led an official delegation to the US for trade talks. Goyal had also visited Washington in May.
While the USA's chief negotiator for the pact is Assistant US Trade Representative for South and Central Asia Brendan Lynch, the Indian side is led by Joint Secretary in the Department of Commerce Darpan Jain.
The talks are also important as Commerce Secretary Rajesh Agrawal has recently stated that India is hopeful of reaching a framework trade deal with the US this year itself, which should address the tariff issue to the benefit of Indian exporters.
While noting that the Bilateral Trade Agreement (BTA) will take time, Agrawal has added that India is engaged in protracted negotiations with the US on a framework trade deal that will address the reciprocal tariff challenge faced by Indian exporters.
India and the US are having two parallel negotiations -- one on a framework trade deal to address tariffs and another on a comprehensive trade deal.
In February, leaders of the two countries directed officials to negotiate an agreement.
It was planned to conclude the first tranche of the pact by the fall of 2025. So far, six rounds of negotiations have been held. The agreement aims to more than double bilateral trade to USD 500 billion by 2030, from the current USD 191 billion.
The US remained India's largest trading partner for the fourth consecutive year in 2024-25, with bilateral trade valued at USD 131.84 billion (USD 86.5 billion exports).
The US accounts for about 18 per cent of India's total goods exports, 6.22 per cent of its imports, and 10.73 per cent of its total merchandise trade.
According to exporters, the agreement is important as India's merchandise exports to the US declined for the second consecutive month in October, falling by 8.58 per cent to USD 6.3 billion due to the hefty tariffs imposed by Washington.
