Terri Randall

After decades of amazing discoveries, spacecraft Cassini embarks on its final - and most daring - mission: a dive below Saturn's rings.

Pearl Randall, a 66-year-old widow, announces that she is planning to remarry, but her three grown children express conflicting emotions. Daughter Terri captures on tape the family's attempts to come to grips with Pearl's new romance.

For decades, UFOs have intrigued the world, but many scientists avoided studying them. In the United States, after highly publicised sightings of unidentified objects by US Navy pilots, UFOs are moving out of the shadows and into the light as NASA pledges to study them scientifically. So what does science have to say? Though some are identified as balloons, drones, weather phenomena or optical illusions, others remain mysterious. Could they be the result of secret new technology? And what would it take for alien engineers to traverse vast distances to send probes or visit Earth from other solar systems? Explore the evidence as astrophysicists and engineers use new technologies to investigate the strangest objects in our skies.

NASA launches its most ambitious hunt for traces of life on Mars, landing a car-sized rover in a rocky, ancient river delta. The rover will stow samples for possible return to Earth and test technology that may pave the way for human travel to Mars.

Spacecraft OSIRIS-REx attempts to grab a piece of an asteroid to bring back to Earth so scientists can study it to learn about the planet's origins.

Wings Over Water tells the fascinating story of naval aviation's critical role in making the U.S. a world power. Film highlights include archival footage of some of the most terrifying and intense airspace battles fought and the intriguing interviews of the veterans who took part in them. This is the story of naval aviation from its conception to the important role it played in battles fought, won, and lost, all the while examining American foreign policy, foreign relations, and long-simmering international conflict. An evocative, powerful, and informative documentary, Wings Over Water is the story behind the story: how and why America developed maritime aviation technology, what it meant to our past, and what it means to our future.

NOVA returns to Ground Zero to witness the completion of One World Trade Center.

The New Horizons spacecraft attempts to fly by a mysterious object known as Arrokoth, believed to be a primordial building block of the solar system. Three years after taking the first spectacular photos of Pluto, New Horizons is four billion miles from Earth, trying to achieve the most distant flyby in NASA’s history. If successful, it will shed light on one of the least understood regions of our solar system: the Kuiper Belt.