Scientists struggle to explain a vast Martian haze spotted in 2012 by amateur astronomers.
A court in the southern Spanish city of Granada drops charges against nine out of 10 Catholic priests accused of sexual abuse.
Libya should not become "a safe haven for terrorists" after the apparent beheadings of 21 Egyptian Christians in the country, David Cameron says.
BBC News has the essential facts about Egypt's minority Coptic Christians.
At least six people are killed in flooding caused by severe rainstorms in the province of Cordoba in northern Argentina.
The woman responsible for hiring a security guard who murdered two colleagues in Iraq was "naive" not to check what turned out to be a forged medical certificate, an inquest hears.
Researchers in Palo Alto in the US state of California are working with the most powerful X-ray laser in the world.
The internet remembers Tony Hart, who died six years ago
Three of Kenya's main private TV stations are unavailable in most of the country due to a row over the switch from analogue to digital transmission.
Ed Miliband shrugs off Ed Balls's claim people should get a written receipt for cash-in-hand work saying he his is more interested in tax avoidance by hedge funds.
Dr John Davies, historian, teacher, author and broadcaster, dies aged 76.
A universal-credit claimant who featured in a government film to promote the reform now says the system is riddled with computer problems and could make people destitute.
We've put some burning questions to Maggie Lieu, the 24-year-old who wants to go to Mars - and never come back.
Three men from Buckinghamshire and London killed in a crash with a coach on the M1 in Bedfordshire are named by police.
Striking images from around the world over the past 24 hours
A new network of £30m research centres is being launched by Alzheimer's Research UK to spearhead the search for an Alzheimer's cure.
Kim Dotcom's lawyer denies that a guilty plea by one of Megaupload's ex-employees will have a major impact on his client's case.
A leading security company says it has uncovered an "unprecedented" cyber-attack on up to 100 banks, but experts are split over its severity.
The Labour-supporting CWU union has been asked to fund a Green Party candidate standing against a shadow minister.
The UK's withdrawal from the European Union would be a "disaster" for both sides, a European commissioner says.