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oxygen

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Space

Pollution on other worlds may show advanced alien life

A NASA telescope should be able to sniff the atmospheres of Earth-sized worlds for industrial gases like CFCs – a sign of civilisation

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Near-death experiences are overwhelmingly peaceful

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Supernovae have the right stuff to mix cement in space

Space

Supernovae have the right stuff to mix cement in space

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Life

Dead exoplanets can have oxygen-rich atmospheres too

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Even lifeless exoplanets can have oxygen-rich air

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First animals may have lived with almost no oxygen

Life

First animals may have lived with almost no oxygen

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Oxygen drop makes people with spine injury more mobile

Health

Oxygen drop makes people with spine injury more mobile

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Drop air pressure to give chickens a stress-free death

Life

Drop air pressure to give chickens a stress-free death

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The oceans are heating, acidifying and choking

Earth

The oceans are heating, acidifying and choking

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Primordial broth of life was a dry Martian cup-a-soup

Life

Primordial broth of life was a dry Martian cup-a-soup

Mars, but not Earth, contained the right elements at the right time to create life's precursor – and this primordial soup was devoid of water

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Space

Biosphere 2: Saving the world within a world

Features

Last Word

Candle in the wind

Regulars

Earth

Everest's final frontier: Life without oxygen

Features

Life

Dawn of the water eaters: How Earth got its oxygen

Features

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