Are interstellar voyages possible within a single human lifetime? According to Einstein's special theory of relativity, the answer is "yes" in principle but "no" in practice, given current technology. You explore the reasons for both answers.

Young Thorfinn dreams of leaving behind the cold climate of Iceland and venturing into the great unknown. But when Viking sails appear on the horizon, the young boy is conscripted into a life of violence and brutality at the hands of merciless Viking Askalaad. With nothing left to him save revenge, Thorfinn swears vengeance against the man who slew his family, plunging headlong into a sprawling, blood-soaked, coming-of-age epic that marches to the...

The HBO Original documentary trilogy GOD SAVE TEXAS takes viewers on a personal and panoramic journey through one of the most controversial states in the union. Returning to their hometowns to shed light on an underrepresented story, the filmmakers chronicle the complex history of each city, exploring how it intertwines with their own provenance and evolution, and placing it in the larger picture of America today. The trilogy is inspired...

This is the story of a young mother living in Northern Ireland fifty years ago, as her country teetered on the brink of civil war. The film tells the tale of a quiet revolution, requiring tremendous courage, that began when three little children were killed. Hundreds of thousands of people — mainly women — rose up to demand that their country change, and then took the concrete action necessary to create that change, themselves. With never-before-seen...

Star clusters are gravitationally bound groups of stars that are all about the same age and the same distance from Earth. Astronomers can determine the approximate ages of clusters. This lecture also explains how the distance of extremely remote stars is found.

This six-part series follows some of the world’s most extraordinary railway journeys from above and on the ground, taking the audience on an adventure of a lifetime. We fly above spectacular scenery and explore exceptional engineering; meeting the people who maintain and run these incredible railroads as well as those who live alongside them.

This lecture explores methods used by astronomers to determine the mass density and expansion history of the Universe. To make this measurement, a race developed between two teams of astronomers searching for Type Ia supernovae in distant galaxies.

Fourteen years into a life sentence, convict Frank Perry (Brian Cox) plans to escape from prison after learning his daughter nearly overdosed from heroin. With the help of fellow prisoners, Frank begins digging tunnels that will lead to the outside world. As Frank and his friends dig, he fends off Rizza (Damian Lewis), a fearsome gangster who runs the inside of the prison, and his brother, Tony (Steven Mackintosh), a junkie with designs on Frank's...

A COUPLE is a film about a long term relationship between a man and a woman. The man is Leo Tolstoy. The woman is his wife, Sophia. They were married for 36 years, had 13 children, nine of whom survived. Each kept a diary. Although they lived together, in the same house, they wrote letters frequently to each other.

Strange memories from a man’s past reveal a dark secret that threatens what he thinks he knows about his life and the world around him.