Stephen Hawking, the physicist who has died at the age of 76, completely changed the way we think about the universe, revolutionising people's understanding of complex subjects like black holes. His bestselling book, A Brief History of Time, opened up the world of cosmology to non-scientists. All of this from a man whom doctors thought wouldn't live beyond his 20s because of motor neurone disease that robbed him of his speech and movement. Alice Gorman, Matthew Bailes, Steven Tingay, Alan Duffy, Jonti Horner and Lisa Harvey-Smith pay tribute to Hawking and his remarkable work.

And the United Kingdom's Astronomer Royal Martin Rees shares his memories of his brilliant colleague.

Russians are due to vote in a presidential election next week, and incumbent Vladimir Putin - who is competing against seven other candidates - looks likely to easily win a fourth term in office. Putin is running as a self-nominated candidate rather than as a representative of the Kremlin’s party, United Russia. Cameron Ross explains why that's not surprising: Putin's personal approval ratings are incredibly high and he's far more popular than the party.