'Water found for first time on potentially habitable planet'
London, Sep 12: Astronomers have for the first time discovered water in the atmosphere of an exoplanet with Earth-like temperatures that could support life as we know it.
K2-18b, which is eight times the mass of Earth, is now the only planet orbiting a star outside the Solar System, or 'exoplanet', known to have both water and temperatures that could be potentially habitable, according to the study published in the journal Nature Astronomy.
The planet orbits the cool dwarf star K2-18, which is about 110 light years from Earth in the Leo constellation, researchers said.
The discovery is the first successful atmospheric detection for an exoplanet orbiting in its star's 'habitable zone', at a distance where water can exist in liquid form, they said.
"Finding water in a potentially habitable world other than Earth is incredibly exciting," said Angelos Tsiaras from the University College London (UCL) in the UK.
"K2-18b is not 'Earth 2.0' as it is significantly heavier and has a different atmospheric composition. However, it brings us closer to answering the fundamental question: Is the Earth unique?" said Tsiaras.
The team used archive data from 2016 and 2017 captured by the ESA/NASA Hubble Space Telescope and developed open-source algorithms to analyse the starlight filtered through K2-18b's atmosphere.
The results revealed the molecular signature of water vapour, also indicating the presence of hydrogen and helium in the planet's atmosphere, researchers said.
They believe that other molecules including nitrogen and methane may be present but, with current observations, they remain undetectable.
Further studies are required to estimate cloud coverage and the percentage of atmospheric water present, the researchers said.
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Jaishankar holds talks with Russia's Lavrov; trade, geopolitics top agenda
New Delhi (PTI): External Affairs Minister S Jaishankar and Russian Foreign Minister Sergey Lavrov held "productive" talks on Wednesday to advance bilateral cooperation in energy and trade amid shifting geopolitical tensions.
Jaishankar met Lavrov, shortly after the Russian foreign minister landed in New Delhi to attend a two-day conclave of the BRICS member states beginning Thursday.
Iranian Foreign Minister Abbas Araghchi, Brazil's Foreign Minister Mauro Vieira and South Africa's Minister for International Relations Ozzy Lamola are among those who already arrived in the national capital for the BRICS foreign ministerial meeting.
Jaishankar and Lavrov are learnt to have deliberated on the West Asia crisis as well as the Ukraine conflict.
In a social media post, the external affairs minister described his talks with his Russian counterpart as "productive exchange of views".
"Our conversation touched upon several aspects of the India-Russia Special and Privileged Strategic Partnership, including trade and investment, energy and connectivity, science and technology, as well as facilitating mobility of skills and talent," he said.
"Other global and multilateral issues of mutual interest were also discussed," he said.
It is not immediately known if India's procurement of Russian crude oil figured in the talks.
In his televised opening remarks at the meeting, Jaishankar said India and Russia have a shared interest in strengthening multipolarity and could benefit through greater "de-risking" .
"The last few years have seen a steady and sustained growth in our bilateral partnership. Its economic and energy dimensions have become pronounced. Our political cooperation is even more valuable in an uncertain and volatile global environment," Jaishankar said.
"We have expanded our collaboration in science and technology. The mobility of talents and skills has acquired greater salience and our interest in ensuring better connectivity is deeper," he said.
"The complicated international situation also merits an open exchange of views, especially between two trusted partners," he said.
The external affairs minister said India and Russia have a shared interest in strengthening multipolarity.
Jaishankar also held separate bilateral talks with Brazilian Foreign Minister Vieira South Africa's Ozzy Lamola.
The external affairs minister also met Maldivian Foreign Minister Iruthisham Adam.
"Underlined our Neighbourhood First policy and reviewed our bilateral cooperation. Reiterated India's commitment to Maldives' progress and development," he said on X.
India, as the chair of the BRICS, is hosting the conclave of the foreign ministers ahead of the annual summit of the grouping in September.
BRICS, originally comprising Brazil, Russia, India, China, and South Africa, expanded in 2024 to include Egypt, Ethiopia, Iran, and the United Arab Emirates, with Indonesia joining in 2025.
It has emerged as an influential grouping as it brings together 11 major emerging economies of the world, representing around 49.5 per cent of the global population, around 40 per cent of the global GDP and around 26 per cent of the global trade.
The BRICS meeting will be chaired by Jaishankar.
