New measurements by Nasa's Cassini probe suggest Saturn's moon Enceladus hides a mass of liquid water as big as Lake Superior under its icy surface.

The Queen meets Pope Francis for the first time, during a one-day visit to Rome in which she also met the Italian President, Giorgio Napolitano.

News International's head of security tells the phone-hacking trial that he is loyal to his employer but "would not commit a crime for anyone".

The chief executive of Mozilla, who had been heavily criticised for supporting a ban on same-sex marriage, has stepped down.

The US Army says there is a "strong possibility" a gunman who killed three people at a base in Texas was involved in a row before the shooting.

The New One, ridden by Sam Twiston-Davies, wins the Aintree Hurdle on day one of the Grand National meeting.

Seven players from Football League clubs in north-west England have been arrested in connection with alleged spot-fixing, the National Crime Agency says.

Barcelona president Josep Maria Bartomeu says the transfer ban handed to the Spanish club by Fifa is an "injustice".