With all the sightings of strange objects in the sky, people have been wondering for decades what these things can be. Whether it’s Roswell or Area 51, people have been convinced there have been ...

Stream now with KPBS+ / Watch Wednesday, Dec. 17, 2025 at 9 p.m. on KPBS TV Hosted by renowned paleontologist Kirk Johnson, this two-hour special takes viewers on a dramatic and surprising adventure ...

Dive into deep time to discover how fossils form, the ocean's surprising origins, and more. What do fossilized leaves, an asteroid, and Florida sinkholes have in common? Dr. Kirk Johnson is Sant ...

Dive into Cashes Ledge with scientists as they race to discover if this remote and relatively pristine part of the Gulf of Maine is vulnerable to rapid warming. Can Cashes still offer hope for the ...

Sinkholes can form either really quickly, or really slowly over a long period of time – and they don’t always come with warning signs. NOVA is available to stream on pbs.org and the free PBS App, ...

Before you submit an error, please consult our Video Help page. NOVA is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire ...

For over 50 years, NOVA has been telling stories of science that bring you – our viewers – along with us on incredible journeys to experience the awe and wonder of our universe. Together, we’ve ...

NARRATOR: Thirteen-thousand years ago, the Earth's climate was not unlike ours today. But then, suddenly, it changed radically. It was mysteriously thrown back into the Ice Age, and some of the ...

For over two centuries, archaeologists have hailed Pompeii as a sophisticated city at the heart of an advanced ancient civilization. But a series of new excavations is painting a much more complex ...