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Message: <blockquote data-quote="Shasarak" data-source="post: 7766082" data-attributes="member: 94143">Sure, lets use your figure.  So the Milky Way is around 13 billion years old and at 0.1c it takes 2 million years to spread across it which gives aliens (or at least their machines) plenty of time to come here.Well that is the thing, we would not have to transmit (or travel) light years to different solar systems.  There should be aliens here right now because they have had enough time.I would not agree with that.  There are plenty of mega projects around the world that took more then 10 years to build like the Pyramid and the Great Wall.  Some estimates put the Great Wall at 200 years.    If thats a bit too fantasy for you then we can go Sci-Fi with the Large Hadron Collider which took 10 years to build and the International Space Station has just been finished recently (also 10 years)If we just stick to Space exploration the Voyager 1 satellite is 41 years old now and left the solar system about 6 years ago.  Imagine if we did the same thing with a 3d printer on board that could build more satellites as it goes.  I dont know that the scientists that designed Voyager imagined that they could do that but it does not seem impossible to do now.</blockquote>