This is a video retweeted by Musk that got over 40 million views: Where are the aliens? According to the Drake Equation, considering the number of planets in the galaxy that could give rise to civilizations, and the probability of those planets evolving advanced civilizations like humans, the conclusion is: The reason we haven’t seen aliens yet is likely because the lifespan of each advanced civilization is less than 5,000 years, meaning humanity might already be at the end of its civilization