As a curious species, humans have long dreamed of traveling to the farthest depths of space. That's the major theme of the upcoming science fiction epic Interstellar, which will take Matthew McConaughey and Anne Hathaway to the places we hope to one day reach ourselves. Except for that tiny hiccup called deep space travel.
The universe is big. And along with its enormous size, it's also incredibly spread-out; any neighboring planets, stars, and galaxies are depressingly distant. Proxima Centauri, the closest star to Earth, is 4.22 light years away. If the fast-moving Voyager spacecraft attempted to reach Proxima Centauri, it would take the tiny probe more than 80,000 years to get there.
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