Welcome to DU!
The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards.
Join the community:
Create a free account
Support DU (and get rid of ads!):
Become a Star Member
Latest Breaking News
Editorials & Other Articles
General Discussion
The DU Lounge
All Forums
Issue Forums
Culture Forums
Alliance Forums
Region Forums
Support Forums
Help & Search
The History of the Telescope Breakthrough: The Ideas That Changed the World Full Episode 1 PBS
(Originally aired in 2019)Meet the brilliant minds throughout history, from Galileo to Edwin Hubble, responsible for creating the telescope. Today, their invention allows humanity to reach the furthest limits of seeing – 13 billion light-years out. (Originally aired in 2019)