Science Channel

When the space shuttle Challenger blew up in 1986, it was the most shocking event in the history of American spaceflight. The deaths of seven astronauts, including the first teacher in space Christa McAuliffe, were watched live on television by millions of viewers. But what was more shocking was that the cause of the disaster might never be uncovered. The Challenger is the story of how Richard Feynman, one of America's most famous scientists, helped to discover the cause of a tragedy that stunned America.

Science Channel reunites Joss Whedon, Nathan Fillion and the entire renegade crew of the Serenity for the first time ever to provide the complete oral history on the franchise that continues to explode in popularity — despite meeting its end a decade ago. The 60-minute special includes secrets from the set, exclusive cast interviews, and footage from this year's colossal Comic-Con panel that dominated the pop culture conversation.

The use of embryonic stem cells has ignited fierce debate across the spiritual and political spectrum. But what if we could create manmade stem cells - or find super cells in adults that could forever replace embryonic cells and remove the controversy? Today, we are on the brink of a new era - an age where we may be able to cure our bodies of any illness. Stephen HAWKING has spent his life exploring the mysteries of the cosmos, now there is another universe that fascinates him - the one hidden inside our bodies - our own personal galaxies of cells.

Recently discovered footage reveals the secret history of NASA's first landing on the moon, and using this brand-new evidence, former astronauts and experts challenge everything known about the Apollo missions.

Richard Feynman is one of the most iconic, influential and inspiring scientists of the 20th century. He helped design the atomic bomb, solved the mystery of the Challenger Shuttle catastrophe and won a Nobel Prize. Now, 25 years after his death - in his own words and those of his friends and family - this is the story of the most captivating communicator in the history of science.

Secluded from view by nine-meter-high walls and composed of 980 buildings, the Forbidden City in Beijing is the largest imperial palace ever built in the world. Three majestic structures form its center and host the city's ceremonies, each of which is considered an architectural masterpiece. In 1406, construction of the Forbidden City was launched at the initiative of one of China's most powerful sovereigns and founder of the Ming dynasty: Yongle. Endowed with divine power, the construction has already resisted more than 200 earthquakes.

Engineers count down the final moments in the world's first ever privately-funded moon mission. In what could be one of the greatest milestones in the history of private space travel, or a spectacular failure, it comes down to sticking the landing.

During the Second World War, to give himself every chance of winning the conflict, Adolf Hitler instructed the most brilliant German scientists to develop advanced technology weapons of mass destruction. Among them were the V1, the first cruise missile, and the V2, the first ballistic missile. The document looks back at the context in which their creators worked and succeeded in designing innovations that laid the foundations of modern aviation and aerospace.

July, 1946. Bikini. It was the first of 23 nuclear tests the US government made in their race against the Soviets during the Cold War. A remote atoll in the Marshall Islands, set in the vast blue expanse of the Pacific Ocean between the Philippines and Hawaii. Ironically though, it was this isolation, that sealed the atoll's fate: During "Operation Crossroads" in July of 1946, two atom bombs were used to sink a ghost fleet of 84 vessels, destroying the natural environment and leaving parts of the huge atoll ring permanently contaminated in the process. The islanders are still reliant on imported food even today.

New evidence is revealing fresh twists to the fatal chain-of-events that caused the Titanic to sink, and using cutting-edge technology and the latest scientific methods, experts investigate the secret history of its infamous sinking.

Led by archaeologist Ciprian Ardlean, this groundbreaking special unearths fresh archaeology that is transforming the understanding of when and who the earliest humans traveled to the Americas.

Stonehenge is one of the world's greatest mysteries. Now, a new discovery found deep in the soil of the surrounding area is threatening to upturn everything we think we know about this 4,500 year-old landmark. Rob Bell joins archaeologists, scientists and engineers who have uncovered a vast, previously undetected monument that is many times the size of the original henge.

Stephen Hawking changed everything we know about black holes but even today, scientists don't know how the very biggest were formed. Now new discoveries might finally solve the mystery of supermassive black holes and reveal the secrets of our galaxy.