Astronomers using the Hubble Space Telescope say our Milky Way Galaxy will crash into its neighbour, Andromeda, in about four billion years.

The population of UK butterflies is continuing its downward trend, according to a nationwide survey of the countryside.

A US government agency goes to court to secure supplies of a drug used in lethal injections, which have dwindled since an importation ban.

Paralysed rats have been able to walk again when their spinal cords were bathed in chemicals and zapped with electricity, scientists have shown.

The merest interaction with a member of the opposite sex can bring a glow to a woman's face, a new study finds.

EU plans for new farm-subsidy rules will reduce European food production and are likely to harm the environment, a Commons committee warns.

One of the two companies planning to build the giant HidroAysen dam in Patagonia has frozen the project, citing lack of government backing.

Astronomers use a high-resolution radio technique for the first time to hunt for signals from potentially habitable planets - but turn up nothing.