Access to this video is a benefit for members through PBS Passport.
Up Next
Back to Show
Watch Preview
NOVA
What Are UFOs?
Season 52
Episode 1
After decades in the shadows, UFOs are being studied seriously. Are they weather balloons, optical illusions, secret military technology? Or something else? Follow scientists as they try to unravel the mystery of the strangest objects in our skies.
Support Provided By
53:42
Step into the stunning cave that’s reshaping our understanding of prehistoric art.
53:41
Witness how Native North Americans have generated scientific knowledge over thousands of years.
53:34
Follow the relentless quest that led to a breakthrough treatment for a deadly disease.
Unlock with PBS Passport
53:40
Archaeologists investigate the dramatic origins of democracy in ancient Greece 2,500 years ago.
53:08
Follow the Artemis mission to bring humanity back to the Moon for the first time since Apollo.
Unlock with PBS Passport
53:25
Surprising evidence at the world’s oldest temple overturns our understanding of human history.
Unlock with PBS Passport
53:40
New evidence sheds light on the remarkable life—and mysterious collapse—of the ancient jungle city.
Unlock with PBS Passport
53:31
What if violent asteroid impacts actually jump-started life on Earth? Explore a dramatic theory.