Panspermia: The Radical Theory of Life's Origins

The chemistry of life could even be spreading across solar systems to other parts of the galaxy, connecting biologies together in a huge web of life. Could we be a part of an ancient cosmic family tree? 

It may sound crazy, but life on Earth could have originated from hardy microbes travelling through space, arriving here from Mars or even more distant parts of our Solar System. In theory, extremophile bacteria could be resilient enough to survive such a deadly journey – perhaps thanks to their ability to repair their own damaged DNA. This documentary explores the fascinating hypothesis of panspermia, taking it to the bold proposition that the building blocks of life may travel across entire stellar systems within our Galaxy. Earth may not be the cradle of life, but merely one stop on its cosmic journey. And if we accept that life can traverse such vast distances, how far-reaching might its true lineage be? Could we, in fact, be extraterrestrial to ourselves?