Having seen an initial glimpse and then another for what Christopher Nolan is cooking up in his post-Batman career, today marks the third trailer for his forthcoming space adventure,Interstellar. While initial previews have highlighted the exquisite universe Nolan has crafted, this trailer is heavier on plot and reveals why Matthew McConaughey is leaving his family behind to lead a spaceship crew into the final frontier. Interstellar opens November 7.