BBC

Steve is a "remarkably common" gas ribbon in the upper atmosphere.

Kuki Gallmann, author of I Dreamed of Africa, is flown to hospital after an ambush, media say.

Labour says it would introduce legislation to tackle the "public health emergency" if in power.

Thousands of scientists demonstrate in cities around the world against an "assault on facts".

Hedgehogs, nursed back to health in an animal sanctuary, are released in the village of Burton Fleming, East Yorkshire.

The Cassini satellite is about to put itself on a path that will take it to destruction in September.

The Amur leopards are to be kept off-show in the hope they raise cubs that can be released into the wild.

The engineer who proposed circular runways answers critics in defence of his radical design for airports.

Killer whale Takara was already pregnant when the end of the breeding programme was announced.

What's made this river in Canada disappear? Geoscientist Daniel Shugar explains.

Russia scales back staff on the ISS until a long-delayed space lab is sent to the outpost in 2018.

Raised coastline could end the threat of sea erosion for the time being.

Boris Behncke lives near Mount Etna and monitors the volcano.

The footprint made by a reptile that lived almost 250 million years ago has been found in the Pyrenees.

Scientists call for "amphibian arks" to protect wild salamanders in Europe from a deadly infection.

European satellites will routinely map every land volcano on Earth, looking for early eruption signs.

A large asteroid the size of the Rock of Gibraltar has passed safely by Earth.

Physicists have created a fluid with negative mass, which accelerates backwards when pushed.

A postbox gets the stamp of approval from a pair of nesting birds.

A study that attached cameras with suction cups to the backs of Antarctic whales has revealed never before seen feeding habits and social interactions.