What can modern results in astrobiology tell us about the prospects for finding intelligent life elsewhere in the Universe? Subscribe for regular science videos: http://bit.ly/RiSubscRibe The famous Drake equation, which provides a rough estimate of the number of civilisations in our galaxy, predicts that space should be teaming with aliens. So where are they and why have we not found them yet? Watch the Q&A here: https://youtu.be/l7Xh_aphD30