BBC
'Alien comet' visitor has weird composition
The first known comet to visit us from another star system has an unusual make-up.
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Air pollution linked to raised Covid-19 death risk
The World Health Organization warns high air pollution could be a risk factor for severe Covid-19 cases.
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Barriers lifted for car-free streets in England
Councils in England can now ban cars from streets more easily to allow space for social distancing.
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Coronavirus: Plasma treatment to be trialled
The hope is blood from coronavirus survivors could treat hospital patients ill with Covid-19.
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Climate change: 'Bath sponge' breakthrough could boost cleaner cars
A new aluminium-based material could make hydrogen-powered cars more practical and less expensive.
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Nasa to launch first manned mission from US in decade
The mission will take place on 27 May using a rocket and spacecraft made by private firm SpaceX.
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Chernobyl wildfire blankets Kyiv in thick smog
Ukraine's capital is now among the world's most polluted cities, an international ranking shows.
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Coronavirus: Sir John Houghton dies of suspected Covid-19
Sir John Houghton, who accepted the Nobel Peace Prize in 2007, died on Wednesday aged 88.
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Coronavirus: Astronaut Helen Sharman shares isolation coping strategies
The UK's first person in space has past experience of restricted movement and time away from family.
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Coronavirus: Is there any evidence for lab release theory?
BBC News examines allegations that the coronavirus was accidentally released from a lab.
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Climate change: US megadrought 'already underway'
A drought as bad as any in recorded history may be underway in the US.
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Coronavirus: Space crew to return to very different Earth
No strangers to isolation, the trio left for the space station months before Covid-19 emerged.
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Europe's Cheops telescope begins study of far-off worlds
Europe's newest space telescope starts its study and characterisation of distant planets.
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Biggest cosmic mystery 'step closer' to solution
New experimental findings could help us solve one of the biggest mysteries about the Universe.
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Coronavirus: Fears of spike in poaching as pandemic poverty strikes
Conservation groups say poaching is on the rise as tourism income dries up at wildlife reserves.
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Climate change: Blue skies pushed Greenland 'into the red'
Cloud-free skies played a key role in one of the worst years for Greenland's ice sheet.
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UK Biobank: DNA to unlock coronavirus secrets
A vast store of DNA is being used to study why the severity of symptoms for coronavirus is so varied.
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Coronavirus: The wildlife species enjoying lockdown
As the UK enters it fourth week of lockdown, conservationists say they've seen some hidden benefits.
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Chernobyl fire under control, Ukraine officials say
Firefighters are tackling remaining "hot spots" near the abandoned nuclear plant, officials say.
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The audacious plan that could save a species
With only two northern white rhinos left in the world - both female - extinction seems a certainty.
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