We think of comets as beautiful glowing balls of light streaking across our skies with their long sweeping tails, yet comets are so much more than just a cosmic firework display. Comets have a uniquely important place in modern science. As time machines from the early universe, they could hold the key to unlock the secrets of the cosmos. Comets could even be the origin of life itself. We follow the incredible odyssey of a comet as it sails through the solar system, watching it's every move as it evolves from a dormant chunk of ice and rock into a tumbling, violently active nucleus engulfed in a gaseous haze. What we learn is a revelation; comets are even more mysterious and fascinating than we had ever imagined.

In this episode, Helen seeks out the colours that turned planet Earth multicoloured. To investigate the essence of sunlight Helen travels to California to visit the largest solar telescope in the world. She discovers how the most vivid blue is formed from sulfur atoms deep within the Earth's crust and why the presence of red ochre is a key sign of life. In gold, she discovers why this most precious of metals shouldn't even exist on the surface of the planet and in white, Helen travels to one of the hottest places on Earth to explore the role salt and water played in shaping planet Earth.

The mission of the film is to underline the crucial ecological role of coral reefs play in maintaining the well being of our planet, and to point out and warn against the dangers that are destroying the world's coral reefs. Entirely filmed using digital technology, thanks to it, the film was shot almost entirely with natural light, thus showing the underwater world as it exactly is. This is the closest you can get to dive without being there. Shot on the Great Barrier Reef in Australia and in the Bahamas, it brings to you the amazing beauty of the many varieties of coral and the immense diversity of the marine life thriving there.

Scorsese filmed the Rolling Stones at the Beacon Theatre on October 29 and November 1, 2006, but the performance footage used in the film is all from the second show. The concert footage is preceded by a brief semi-fictionalized introduction about the preparations for the shows, and is intercut with historical news clips and archival interviews with band members. The film takes its title from the song of the same name, featured on the band's 1972 album Exile on Main St. A soundtrack album was released in April 2008

BC's illegal marijuana trade industry has evolved into a business giant, dubbed by some involved as 'The Union', Commanding upwards of $7 billion Canadian annually. With up to 85% of 'BC Bud' being exported to the United States, the trade has become an international issue. Follow filmmakers Adam Scorgie and Brett Harvey as they demystifies the underground market and brings to light how an industry can function while remaining illegal. Through growers, police officers, criminologists, economists, doctors, politicians and pop culture icons, Scorgie examines the cause and effect nature of the business - an industry that may be profiting more by being illegal.

Take a look back at many of the most fascinating science stories of 2017, a year full of stunning advancements in individual fields of study, from astronomy to biology, geology to history – when we piece these discoveries together we see the year in a new light.