Eight mind-expanding quests probe the universe's greatest unanswered mysteries.
Across eight adventures, this series explores some of the biggest mysteries in the universe through ambitious space science and discovery. From rockets built for deep space to exoplanets, Mars, and the origins of the cosmos, each episode opens a new frontier of ideas. Sign up to follow the questions that keep expanding our view of what is possible.
Episode guide
8 episodes- New shows weeklyFresh documentaries land every week.
- Exclusive originalsAward-winning films you can’t stream anywhere else.
- Watch anywherePhone, tablet, web and TV — pick up where you left off.
- No commitmentNo contract. Cancel in a click.
Frequently asked questions
Yes. Every plan unlocks the full library — including all Curiosity Originals like Secrets of the Universe — in up to 4K, ad-free, on all your devices.
Secrets of the Universe is a Curiosity Original, exclusive to Curiosity Stream.
Watch on the web, iOS and Android, Roku, Apple TV, Amazon Fire TV, Chromecast, Android TV, and most smart TVs. Start on one device and pick up right where you left off on another.
Curiosity Stream is our streaming service — thousands of documentaries and originals. The Smart Bundle is Curiosity Stream plus four other independent streaming services (Tastemade, Kidstream, Curiosity University, and SOMM TV) on a single subscription.