BBC

The first known comet to visit us from another star system has an unusual make-up.

The World Health Organization warns high air pollution could be a risk factor for severe Covid-19 cases.

Councils in England can now ban cars from streets more easily to allow space for social distancing.

The hope is blood from coronavirus survivors could treat hospital patients ill with Covid-19.

A new aluminium-based material could make hydrogen-powered cars more practical and less expensive.

The mission will take place on 27 May using a rocket and spacecraft made by private firm SpaceX.

Ukraine's capital is now among the world's most polluted cities, an international ranking shows.

Sir John Houghton, who accepted the Nobel Peace Prize in 2007, died on Wednesday aged 88.

The UK's first person in space has past experience of restricted movement and time away from family.

BBC News examines allegations that the coronavirus was accidentally released from a lab.

A drought as bad as any in recorded history may be underway in the US.

No strangers to isolation, the trio left for the space station months before Covid-19 emerged.

Europe's newest space telescope starts its study and characterisation of distant planets.

New experimental findings could help us solve one of the biggest mysteries about the Universe.

Conservation groups say poaching is on the rise as tourism income dries up at wildlife reserves.

Cloud-free skies played a key role in one of the worst years for Greenland's ice sheet.

A vast store of DNA is being used to study why the severity of symptoms for coronavirus is so varied.

As the UK enters it fourth week of lockdown, conservationists say they've seen some hidden benefits.

Firefighters are tackling remaining "hot spots" near the abandoned nuclear plant, officials say.

With only two northern white rhinos left in the world - both female - extinction seems a certainty.