By creating an account, you acknowledge that PBS may share your information with our member stations and our respective service providers, and that you have read and understand the Privacy Policy and Terms of Use.
Become a NHPBS member to enjoy
NHPBS
Passport
Get extended access to 1600+ episodes, binge watch your favorite shows, and stream anytime - online
or in the PBS app.
Season 1 Episode 25 | 6m 14s
| Video has closed captioning.
Everyone has their own opinion as to whether or not aliens exist. But let’s assume they do for a second and we wanted to let them know we're here!!!! How should we signal our species' existence through the expanse of space? There are a few options, but which is the most effective and the cheapest? Find out in this week’s episode of PBS Space Time!
