Dara and Brian's journey through the night sky continues with a look into the distant past, explaining how it is possible to chart the history of the universe by looking million of light years out into the depths of space. Meanwhile, Mark Thompson reveals what can be learned from the colours of the stars. At NASA, Liz Bonnin meets the team building the largest space telescope in the world, an instrument that's 100 times more powerful than the Hubble.
The Big Bang - how do we know?
Universe through time poster
Astronomy through social media
Web producer Simon Mackie writes about life on location for the Stargazing web team, and how they use Twitter, Flickr, live web chats and citizen science to engage with the audience at home.
|Presenter||Dara O Briain|
|Series Producer||Alan Holland|
|Executive Producer||Helen Thomas|