I found this video on YouTube yesterday, and watched it today.
Pretty optimistic, but without being unrealistic - and with some new information I didn't knew about...
Two possibilities exist: either we are alone in the Universe or we are not.
Both are equally terrifying.
Arthur C. Clarke
LIFE BEYOND: Chapter 1. Alien life, deep time, and our place in cosmic history (4K).
And one of the best parts are not in the video, but on the Summary: a list of every source used to create the video!