Kenyan Elections 2017: What You Need To Know

Kenya goes to the polls next week, with sitting President Uhuru Kenyatta and challenger Raila Odinga vying for the top job.

The Jamaican sprinter, Usain Bolt, plans to run for the last time at the 100m finals and 4x100m relay at the World Championships in London this weekend.

Researchers have released the most accurate map ever produced of the dark matter in our Universe. It's hoped the map will help scientists understand what dark matter is made from and learn more about another mysterious phenomenon called dark energy.