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The Grabby Alien Model
We are almost 14 billion years into the universe on a planet around a star that's roughly 5 billion years old. The average star out there will last roughly 5 trillion years. That is a thousand times longer than our planet, which means advanced life had to show up now before it was too late. Our best evidence why you should believe this model is our early date. And at the moment, as you saw in the video, the universe is filling up in roughly a billion years, it'll all be full. At that point, it's too late for advanced life to show up.