Sky History 2 Tuesday

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

The suggestion that some animals may have been planted on Earth by aliens as part of an experiment to shape life on Earth

Hitler's invasion of the Soviet Union on June 22, 1941. His aim was to weaken Britain in Europe and gain 'lebensraum', or living space, in the East

The battle hit a turning point and Donitz unleashed an advanced torpedo to flip the momentum. Roberts and Laidlaw then had to devise a strategy to combat the new threat

How Elizebeth Friedman cracked the codes that brought down the Mob and saved countless lives in the Second World War, armed with just a pencil and paper

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

The suggestion that some animals may have been planted on Earth by aliens as part of an experiment to shape life on Earth

Strategic catastrophes and doomed military decisions, beginning with those whose rampant egos and misguided belief in their own abilities led to fatal mistakes

How the seeds of Japan's Second World War defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China

How Germany, Italy and Japan's ruthless, brutal occupation and exploitation of other countries contributed to the demise of the so-called Axis Powers

Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. The episode explores how the Axis powers failed in this regard

A look at how each Axis Power had troubles on their own home front, leading to disaster in the final days of the Second World War

An examination of a video showing a strange formation of flickering lights. Plus, a mysterious humanoid creature caught on camera in an abandoned attic

The battle hit a turning point and Donitz unleashed an advanced torpedo to flip the momentum. Roberts and Laidlaw then had to devise a strategy to combat the new threat

How Elizebeth Friedman cracked the codes that brought down the Mob and saved countless lives in the Second World War, armed with just a pencil and paper

The criminal gangs across the world using highly encrypted phones to stay under the radar

At Mexico City's Templo Mayor, archaeologists uncover a 15th-century tower of 600 skulls, revealing new insights into Aztec sacrifice and ritual

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

The suggestion that some animals may have been planted on Earth by aliens as part of an experiment to shape life on Earth

Giorgio Tsoukalos decodes some of the evidence for Ancient Astronaut theory found in mysterious carvings, symbols and structures that are similar on opposite ends of the Earth

Hugh Dennis and the team solve a 17th-century mystery in King's Lynn, as they hunt for enormous defensive earthworks that surrounded the Norfolk town during the English Civil War

In Scotland and northern England, Alice Roberts investigates an Ice Age camp, a mysterious medieval skeleton and the earliest evidence of salt making in Britain

Cameras capture a psychedelic swirl in the Utah wastelands, a bizarre configuration of circles in the Sahara and a remote polka-dot lake in Canada.

Scott begins a dangerous climb to snag a rare gem. Later at a retro service station, the guys hatch a cunning plan which might just pay off - but at what price?

The US military has denied that the infamous 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo to J Edgar Hoover