Undaunted: The Forgotten Giants of the Allegheny Observatory

This documentary examines theories behind the creation of gamma ray bursts, destructive explosions in space that can wipe out entire star systems.

Kate Humble and Helen Czerski reveal the inner workings of the sun and investigate why scientists think changes in the sun's behaviour may have powerful effects on our climate.

Blue Peter presenters Helen Skelton and Barney Harwood want to learn more about the solar system so they challenge scientists Helen Czerski and Jem Stansfield to find out more. They look at how to make telescopes and rockets, and use a toilet roll to measure the distances between planets.

A short documentary about an engineer in a Chilean observatory.

A short documentary interviewing a renown astronomer and astrophysicist.

A short documentary interviewing an astronomer.

A short documentary of filmmaker Patricio Guzmán interviewing local astronomers.

A brief history of British aviation and the development of both civil and military aircraft. Made for the Festival of Britain.

Panair do Brasil revives the story of the most important commercial aviation company in Brazil, between 1930 and 1965, with its commercial daring in establishing routes to the four corners of a continental country, taking the adventure of air transport to never-before imagined places, as well as the first international routes. Four decades after it closed its doors, it still retains a marked presence in the country's collective imagination for its pioneering spirit and stories of heroic deeds and for the bewilderment which was aroused by the facts surrounding its closure during the military regime.

For early aviators, conquering the forces of gravity was a daunting challenge. But black aviators had an additional challenge - conquering the forces of racism. Meet the men and women who took to the skies throughout the 20th century, proving to a segregated nation that skin color doesn't determine skill level. From biplanes to commercial jets, and from barnstormers to war fighters, meet the path-breaking pilots who opened the skies for all - and contributed in countless ways to the development of aviation.

The De Havilland Comet was the world's first passenger jet airliner. But less than two years into service, two aircraft blew up in mid-air, killing all aboard. PM Winston Churchill ordered an assemblage of experts to discover what went wrong - in the process, inventing many of the air crash investigation techniques still used today.