Kirsty Young's castaway is Chris Hadfield.

He was the first Canadian commander of the International Space Station and took part in three space missions spending a total of 166 days orbiting the Earth. He has spent over 14 hours doing two space walks.

He flew his first eight day mission into space in 1995 during which he visited the Russian space station Mir. In 2001 he paid his first visit to the International Space Station to help install Canadarm2, a robot arm helping to build the station which was launched three years previously. In 2012 he began his final five month stay in space on board the ISS. It was on this mission that his videos of life in space - including a film of him singing David Bowie's Space Oddity and accompanying himself on guitar - led to him enjoying a huge following on social media.

Chris was born in 1959 in Ontario, the second of five children: his father was a pilot and the family lived on a farm. He mapped out his future career aged nine when he watched Neil Armstrong become the first person to walk on the moon in 1969. In pursuit of his dream Chris first become an Air Cadet, then attended military college, becoming a fighter pilot and then a test pilot, as well as an aeronautical engineer. He finally achieved his ambition of becoming an astronaut in 1992.

He went onto become the Chief of Robotics at the NASA Astronaut Office and Chief of International Space Station Operations at the Johnson Space Centre in Houston, Texas. Following his final space mission, Chris retired from the Canadian Space Agency in July 2013. Amongst the awards he's received are the military Meritorious Service Cross, NASA's Exceptional Service Medal and the Queen's Diamond Jubilee Medal.

Producer: Cathy Drysdale.

Kirsty Young's castaway is Kylie Minogue.

With seven number ones and ten million singles sold in the UK, she is the third-biggest selling female artist in Britain and has sold around 70 million records worldwide.

Born in Melbourne in 1968, Kylie and her sister Dannii began their careers as child actors on Australian television. At 17, Kylie landed the role of Charlene Mitchell in the soap opera Neighbours and her on-screen wedding to Jason Donovan's character Scott Robinson was watched by twenty million people in the UK alone.

Her recording career began after she was spotted singing at a charity event in 1987. Within months she had released a cover version of "Locomotion" which became the biggest-selling Australian single of the decade. Following the single's success, her first hit with record producers Stock, Aitken and Waterman was "I Should Be So Lucky": her debut album sold seven million copies.

At the age of 21, a romance with INXS lead singer Michael Hutchence led to a change in her image. In 2000, inspired by 1970s disco and assisted by gold hot pants, her single "Spinning Around" became her first British number one for a decade. She also sang to an estimated global audience of 3.7 billion at the closing ceremony of the Sydney Olympics.

In May 2005 she was diagnosed with breast cancer: following treatment she resumed the tour 18 months later.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the surgeon, author and former Reith lecturer, Atul Gawande.

A general and endocrine surgeon in Boston, he is professor in both the Department of Health Policy & Management at the Harvard School of Public Health and the Department of Surgery at Harvard Medical School.

Born in Brooklyn, he is the son of two doctors who came to the US to study medicine. After graduating from Stanford and studying Philosophy, Politics and Economics at Oxford, he embarked on a brief political career, working for Bill Clinton's presidential campaign and on his health and social policy in the White House following his election. When Clinton's health policy reform floundered, Atul returned to Harvard to finish the medical degree he'd started after Oxford.

During his surgical residency he began writing for the online magazine Slate and he's been writing for the New Yorker since 1998. His 2009 article "The Cost Conundrum" was cited by President Barack Obama during his attempt to get the healthcare reform legislation through Congress. Atul has published four books to date about the achievements, but also the limitations, of medicine.

In 2014 he presented the BBC's Reith Lectures, delivering a series of four talks titled The Future of Medicine.

Producer: Cathy Drysdale.

Kirsty Young's castaway this week is Sandi Toksvig.

Host of BBC Radio 4's News Quiz until June 2015, she is also a writer and comedian and recently entered the world of politics, helping to found the Women's Equality Party.

Her parents were both broadcasters: her mother worked as a studio manager and announcer before she married, her Danish father's job as a foreign correspondent took the family around the world. Sandi and her siblings spent much of their childhood in the United States and when she was "asked to leave" yet another American school, her parents sent her to boarding school in England. She soon decided to lose her strong American accent and went on to Cambridge, where she performed in the Footlights.

In addition to writing, her most recent acting role was in Call the Midwife and she continues to appear regularly on TV and radio shows as a panelist: she is to start as the next host of QI, taking over from Stephen Fry. She's also Chancellor of Portsmouth University.

Kirsty Young's castaway is filmmaker Gurinder Chadha.

Writer, director and producer behind the films Bend it like Beckham, Bhaji on the Beach and Bride and Prejudice, she began her career as a BBC news reporter.

She was born in Kenya to Sikh parents and grew up in Southall in West London. Her political awakening came in her teens in the 1970s against the backdrop of the National Front and race riots in the capital. The bands she listened to, including the Clash, the Jam and the Specials, were fixtures at the Rock Against Racism concerts which galvanised her desire to make a difference.

Bend it Like Beckham, which launched the career of Keira Knightly, is now a hit musical on the West End stage. Her next film, Viceroy's House, tackles the Partition of India in 1947.

She was awarded an OBE in the 2006 Queen's Birthday Honours List for her services to the British Film Industry.

Producer: Paula McGinley.

Kirsty Young's castaway is the Right Honourable Nicola Sturgeon, MSP.

Leader of the Scottish National Party (SNP) and the fifth First Minister of Scotland in the devolved era, she is the first woman to hold either post. The eldest of two daughters, she was brought up in Irvine and attended the local Dreghorn Primary School. A studious child, she was encouraged in her interest in current affairs by a teacher and joined the SNP aged 16. At 21, she was the youngest candidate in the 1992 General Election, contesting the safe Labour seat of Glasgow Shettleston.

She learned a lot about electoral defeat in those first years, but after several unsuccessful attempts, she was elected to the Scottish Parliament as a list MSP for Glasgow in 1999. She served as the party's shadow minister for education, and later for health and for justice and was elected deputy leader of her party in 2004, standing on a joint ticket with Alex Salmond. When the SNP won the highest number of seats in the 2007 election, she was appointed deputy First Minister. She also took on responsibility for the SNP's independence referendum campaign.

In November 2014, following the No vote in the Scottish independence referendum and the subsequent resignation of Alex Salmond, Sturgeon was elected leader of the SNP and became First Minister of Scotland. She's been awarded the Scottish Politician of the Year award three times and in 2015 was judged to be the Most Influential Woman in the UK by BBC Radio 4's Woman's Hour.

She is married to Peter Murrell, Chief Executive of the SNP.

Producer: Cathy Drysdale.

Kirsty Young's castaway is the broadcaster and religious leader, Lord Indarjit Singh.

Producer: Sarah Taylor.

Kirsty Young's castaway is the mental health campaigner and Chief Executive of SANE, Marjorie Wallace.

After leaving University College London with a psychology and philosophy degree, her first job in the media was working on The Frost Programme with David Frost. She went on to produce religious programmes and became a current affairs reporter and director for the BBC. She joined the Sunday Times Insight team as an investigative journalist and wrote a series of articles highlighting the financial and emotional plight of young Thalidomide victims. Her articles on mental illness - The Forgotten Illness - elicited a huge public response and in 1986 she founded the mental health charity SANE. She has received numerous awards for her journalism and books and has twice won the Campaigning Journalist of the Year award.

In December 2008 she was awarded the CBE for services to mental health.

Producer: Sarah Taylor.

Keith Richards, member of the Rolling Stones, is interviewed by Kirsty Young for Desert Island Discs.

Keith was born in Dartford and grew up as an only child. He and Mick Jagger went to the same primary school, but then lost touch until meeting again at Dartford train station in 1961 and discovering they shared a taste in blues music. Keith picked up his love of the guitar from his grandfather and honed his skills whilst at art college.

If one single, living person could be said to personify rock n' roll then it is surely him. He's been making music and causing havoc for over half a century and counting. His song writing, singing and guitar playing have helped to make The Rolling Stones a stratospherically successful group and his early and single minded dedication to the triumvirate pursuits of sex and drugs and rock and roll made him a counter-culture icon.

No surprise then that as a boy he would go to sleep at night with his arm around his first guitar.

Producer: Sarah Taylor.

Kirsty Young's castaway is Professor Sue Black.

She is Professor of Anatomy and Forensic Anthropology at the University of Dundee, founder and past President of the British Association for Human Identification and heads the Centre for Anatomy and Human Identification in Dundee.

Brought up on the west coast of Scotland and in Inverness, she fell in love with biology at secondary school and read Human Anatomy at the University of Aberdeen. After graduation she worked at London's St Thomas' Hospital as an anatomist and police began to call on her to help identify bones.

In 1999 she travelled to Kosovo, tasked with investigating the site of a mass shooting. She has worked in areas of conflict including Iraq and was part of the team helping to identify victims of the 2004 Indian Ocean tsunami.

She was awarded an OBE in 2001 for her services to forensic anthropology.

Producer: Cathy Drysdale.