Countless mysterious objects have been spotted in the sky and many astronauts have reported seeing UFOs. NASA's Unexplained Files reveals groundbreaking footage and interviews from both astronauts and scientists to explore the idea that there could be life outside of our planet.

The Rosetta mission that made historic discoveries on Comet 67P comes to a dramatic end. The spacecraft that brought back incredible photos and ground-breaking science will crash onto the comet’s surface.

Meet the scientists and modern explorers determined to send humans to Mars. As NASA builds its first spacecraft to carry astronauts to Mars and visionaries devise extraterrestrial colonies, our future on the Red Planet might be sooner than we think.

Scientists are going in-depth to explain what asteroids are and what they could potentially do. Learn about these fascinating space objects and just how real of a threat they actually are.

Prof. Brian Cox takes viewers on a journey to explore how deep space can be explained -- and even experienced -- by re-examining the familiar here on Earth. The same physical laws that describe the behavior of light, gravity, and time can explain the qualities of the universe!

After 20 years in space, NASA's Cassini is nearing the end of its remarkable journey of exploration.

Mission Tomorrow is the ultimate quiz of your space smarts. Join host Joanna Hausmann (writer/correspondent for 'Bill Nye Saves the World') as she navigates through the past, present, and future of space exploration and the ingenuity and innovations of scientists and astronauts.

Humanity is crossing into final frontier and embarking on history's greatest adventure. All over the world, men and women are drawing up blueprints to transform this science fiction scenario into science fact. The questions are: who, when and how?

Years after mankind's first steps on the lunar surface, reaching the Moon is still a metaphor for an impossible journey. While astronauts who walked on the Moon became household names, those who created the machines that made their journeys possible have been forgotten.

New information reveals the secret story of the Apollo 13 rescue, and how America's best minds used innovative science and engineering to save the lives of three astronauts facing life-or-death on one of NASA's most dangerous missions.

Truth Behind the Moon Landing tests evidence and applies scientific reasoning to conspiracies with the help of former NASA astronaut Leland Melvin, Iraq War veteran and former FBI agent Chad Jenkins, and author Mike Bara.

For the first time, an image of black hole has been revealed, and experts show how they did it, what they saw, and the incredible significance of this groundbreaking discovery.

Apollo: The Forgotten Films, tells the complete story of this most audacious of missions, with footage not seen anywhere else. The archives reveal the incredible lengths an army of engineers, scientists and astronauts went to, to achieve America’s greatest technological feat.

What’s it like to leave earth to explore the unknown? What happens when you’re in space and something goes terribly wrong? Secret Space Escapes reveals terrifying accidents, fights for survival, and stories of close calls and near misses by the astronauts who survived them.