The Fermi Paradox - Why we haven't been contacted by aliens

[DaFace]

A point made by Cosmos in a recent episode is that we're not only dealing with a challenge of space, but also of time. In other words, the math says that there should be a ton of other planets with life on them, but what's to say that life hasn't already come and gone on most of them? If it turns out that there just isn't a way to go faster than the speed of light, it's entirely plausible that we just won't have anyone else close enough and at the right point in time to find anything out there.