http://bbc.in/204LqFx Sir David Attenborough investigates what could be the biggest animal ever to walk the earth.

Watch: Major Tim Peake becomes the first British astronaut to conduct a #spacewalk: http://trib.al/jDFkXnG

Saudi Arabia’s foreign minister has used a trip to London to robustly defend his country’s more assertive role in the world, despite concerns it could escalate tensions with Iran.

After meeting US Secretary of State John Kerry, Adel al Jubeir insisted his country was right to intervene more aggressively in parts of the Middle East in an interview with Sky News.

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The plot reads like a Hollywood movie and involved millions of pounds of diamonds and a group of ageing villains. Martin Brunt looks at the story behind Britain’s biggest burglary.

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Astronomers combined data from three of NASA’s Great Observatories to make the most detailed study yet of an extremely massive young galaxy cluster. The object is a rare cluster of galaxies, which is located 10 billion light-years from Earth. It is almost as massive as 500 trillion suns. How are these huge structures formed in the universe? Tune in to find out. The galaxy cluster, called IDCS J1426.5+3508 (IDCS 1426 for short), is so far away that the light detected by the observatories originated when the universe was young, roughly a quarter of its current age. It is the most massive galaxy cluster detected at such an early age.

Programme website: http://bbc.in/1WbLwJb The Sport Relief Games will take place at the Queen Elizabeth Olympic Park and at events in Belfast, Cardiff, Glasgow, Norwich and Sheffield. Sign up now at bbc.co.uk/sportrelief

Programme website: http://bbc.in/1J5qQAG Natasha has her suspicions about Dolokhov who she thinks is somehow cruel but Nikolai ignores her instincts.

Leonardo DiCaprio describes his Oscar nomination for The Revenant as “very exciting” at the film’s London premiere: http://news.sky.com/story/1622968/dicaprio-surprised-by-the-revenants-success

Filmed for BBC Radio Scotland and The Quay Sessions at the CCA in Glasgow. For more: http://www.bbc.co.uk/celticconnections