Sky History 2 Wednesday

Experts question what probes on Mars may have found over the past 40 years, asking if Nasa could be hiding proof of life on the Red Planet from the public

Forest fires threaten Rust Valley and after his neighbour loses 350 cars, Mike hoards back fuel in case he needs to save his own collection

Terry Schappert examines how Saxons withstood an attack from a Viking fleet during the Battle of Maldon in 991

How Constantine I became the first Christian Emperor, allowing the religion to spread through Europe and thus have a profound impact on the course of Western civilisation

Divers Fabien and Céline Cousteau investigate one of the most credible UFO sightings in history - a strange alien craft seen crashing into the ocean

Investigating cosmism - a belief that human civilization originated in the cosmos. This train of thought is widely held throughout Russia