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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Texas halts H-1B visas at state universities, agencies; to affect Indians
Houston (US) (PTI): Texas Governor Greg Abbott has ordered state agencies and public universities to immediately halt new H-1B visa petitions, tightening hiring rules at taxpayer-funded institutions, a step likely to impact Indian professionals.
The freeze will remain in effect through May 2027.
The directive issued on Tuesday said that the state agencies and public universities must stop filing new petitions unless they receive written approval from the Texas Workforce Commission.
The governor's order, in a red state that is home to thousands of H-1B visa holders, comes as the Trump administration has initiated steps to reshape the visa programme.
“In light of recent reports of abuse in the federal H-1B visa programme, and amid the federal government’s ongoing review of that programme to ensure American jobs are going to American workers, I am directing all state agencies to immediately freeze new H-1B visa petitions as outlined in this letter,” Abbot said.
Institutions must also report on H-1B usage, including numbers, job roles, countries of origin, and visa expiry dates, the letter said.
US President Donald Trump on September 19 last year signed a proclamation ‘Restriction on entry of certain non-immigrant workers’ that restricted the entry into the US of those workers whose H-1B petitions are not accompanied or supplemented by a payment of USD 1,00,000.
The H1-B visa fee of USD 1,00,000 would be applicable only to new applicants, i.e. all new H-1B visa petitions submitted after September 21, including those for the FY2026 lottery.
Indians make up an estimated 71 per cent of all approved H-1B applications in recent years, according to US Citizenship and Immigration Services (USCIS), with China in the second spot. The major fields include technology, engineering, medicine, and research.
Tata Consultancy Services (TCS) is the second-highest beneficiary with 5,505 approved H-1B visas in 2025, after Amazon (10,044 workers on H-1B visas), according to the USCIS. Other top beneficiaries include Microsoft (5,189), Meta (5,123), Apple (4,202), Google (4,181), Deloitte (2,353), Infosys (2,004), Wipro (1,523) and Tech Mahindra Americas (951).
Texas public universities employ hundreds of foreign faculty and researchers, many from India, across engineering, healthcare, and technology fields.
Date from Open Doors -- a comprehensive information resource on international students and scholars studying or teaching at higher education institutions in the US -- for 2022-2023 showed 2,70,000 students from India embarked on graduate and undergraduate degrees in US universities, accounting for 25 per cent of the international student population in the US and 1.5 per cent of the total student population.
Indian students infuse roughly USD 10 billion annually into universities and related businesses across the country through tuition and other expenses – while also creating around 93,000 jobs, according to the Open Doors data.
Analysts warn the freeze could slow recruitment of highly skilled professionals, affecting academic research and innovation.
Supporters say the directive protects local jobs, while critics caution it could weaken Texas’ competitiveness in higher education and research.
The order comes amid broader debate in the US over skilled immigration and state-level interventions in federal programmes.
H-1B visas allow US companies to hire technically-skilled professionals that are not easily available in America. Initially granted for three years, these can be extended for another three years.
In September 2025, Trump had also signed an executive order ‘The Gold Card’, aimed at setting up a new visa pathway for those committed to supporting the United States; with individuals who can pay USD 1 million to the US Treasury, or USD 2 million if a corporation is sponsoring them, to get access to expedited visa treatment and a path to a Green Card.
