Nasa has cracked the mystery over Mars missing atmosphere

Scientists have documented a solar storm blasting away Mars atmosphere, an important clue in a long-standing mystery of how a planet that was once like Earth turned into a cold, dry desert, Nasa scientists said on Thursday (5 November). On 8 March, Nasas Mars-orbiting Maven spacecraft caught such a storm stripping away the planets atmosphere, scientists said. Maven lead researcher Bruce Jakosky said the stripping of Mars atmosphere took place hundreds of millions of years ago and has slowed down since. Nov 6, 2015

Hundreds protest David Cameron’s welcome of Egypt’s President Sisi to UK

Hundreds gathered outside Downing Street in London on Wednesday (4 November) to protest against the visit of Egyptian President Abdel Fattah al-Sisi. Sisi, who launched the toughest crackdown on Islamists in Egypts modern history after toppling President Mohamed Morsi of the Muslim Brotherhood, met Prime Minister David Cameron to boost the countries ties. Nov 5, 2015

Rare 12-carat blue diamond expected sell for $35-55m at auction

An extremely rare 12-carat blue diamond, exhibited by Sothebys in Geneva on Wednesday (4 November), is expected to break a record at auction in a weeks time with a price estimate of $35-55m (£23-36m).The gem was discovered in January 2014 as part of a 29.62 carat blue rough diamond at Cullinan mine in South Africa, the worlds main source for blue diamonds. Sothebys International Jewellery Division Chairman and Auctioneer, David Bennett, said that experts had deemed it internally flawless due to its clarity, colour and size. Nov 4, 2015

Yemen: Cyclone Chapala batters coast as thousands flee homes

A cyclone with hurricane-force winds made landfall on Yemens Arabian Sea coast on Tuesday (3 November), flooding the countrys fifth-largest city Mukalla and sending thousands of people fleeing for shelter. Officials and meteorologists say the storm is the most intense in decades in the arid country, whose storm response is hampered by poverty and a raging civil war. Nov 4, 2015

Jerusalem: Ancient Greek fortress Acra uncovered

After a century of searching, archaeologists say they have found the remnants of an ancient Greek fortress once a centre of power in Jerusalem and a stronghold used to fight a rebellion celebrated in the Jewish holiday Hannukah. Nov 3, 2015