WASHINGTON -- A century after Albert Einstein explained his General Theory of Relativity, scientists say they have finally found elusive gravitational waves.
As these mysterious ripples in the fabric of space pass Earth, local space is alternately stretched and compressed. The Laser Interferometer Gravitational-Wave Observatory (LIGO) Collaboration operates a number of labs around the world that fire lasers through long tunnels, trying to sense ripples in the fabric of space-time.
DAMASCUS -- Over 11.5 percent of Syria’s population have been killed or injured since the bloody crisis in the country erupted in March 2011, according to a new report.
VERDUN -- Commemorations begin on February 21, marking the centenary of the Battle of Verdun while July 1 marks the centenary of the Somme offensive.
HAVANA -- Pope Francis and the leader of the Russian Orthodox Church meet in a bid to heal the 1,000-year-old schism that divided Western and Eastern Christianity.
ALEPPO -- The UN says up to 300,000 people could be cut off from basic food supplies if Syrian government forces encircle parts of the northern city of Aleppo.
WASHINGTON -- Less than 100 super-rich individuals – many with ties to oil or Wall Street – have donated $183 million to Super PACs backing presidential contenders.
BRUSSELS -- NATO defence ministers meet on Wednesday to discuss bolstering troop presence in eastern Europes to its highest level since the Cold War.
WASHINGTON -- The Pentagon says it is planning to deploy a THAAD defence system to South Korea to protect against potential North Korean ballistic missile attacks.
DAMASCUS -- Russia has sent its newest and most potent warplane – the Su-35 “Flanker-E” – to support airstrikes in Syria.
HAVANA -- Pope Francis will visit some of the poorest and most violent corners of Mexico on his first visit as pontiff.
CARDINGTON -- The world's largest aircraft – part plane, part airship and part helicopter – will make its maiden flight in the UK in March. The Airlander 10 is 91m long and 26m high.
RIO DE JANEIRO -- Authorities have said the Olympics will not be cancelled because of the Zika virus outbreak and there was no risk to athletes or spectators, except pregant women.
TOKYO -- Over 36,000 runners are expected to participate in the 10th Tokyo Marathon. Tokyo was promoted in 2013 to become one of the six World Marathon Majors.
DUNEDIN -- The southern hemisphere’s top rugby union club tournament kicks off, with two teams from Japan and Argentina joining a radical new format.
BEIJING -- The Chinese Super League has surpassed the spending power of the Premier League after Alex Teixeira agreed a record £38.4m move to Jiangsu Suning.
KARLSTAD -- The only true winter round of the World Rally Championship takes place in the frozen forests around Hagfors, characterised by frozen roads lined with snow banks.
MELBOURNE -- A record 21-race season - including a new race on the streets of Baku, Azerbaijan - starts with the Australian GP and ends in Abu Dhabi in November.
QATAR -- The 2016 MotoGP season comprises 18 Grands Prix, commencing with the Qatar GP in March and concluding in Valencia, Spain in November.
DUBLIN -- Ireland begin their campaign for a third successive title against Wales. No team has retained the trophy more than twice since France won four in a row from 1986-89.