The Voyager 1 probe is about a billion miles away from the Earth, having been travelling for 30 years now. This equates to the distance light travels in slightly under two hours. Yet, the nearest star is 4 light years away. To explore this Universe we are going to have to accelerate. The Voyager probe is travelling very quickly, but it's not accelerating. I showed in a previous post that if we were to travel away from the Earth on a ship accelerating at a mere 1g, so Earth's gravity (it would be nice and comfortable for us) then we'd get to the edge of the observable universe, 14 billion light years away, in just 25 years of ship time. This would be 14 billion years or so of Earth time of course.
Oh it's all relative :)
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