Is there a border we will never cross? Are there places we will never be able to reach, no matter what? It turns out there are. Far, far more than you might have thought…

Check out Ethan Siegels Astronomy blog, "starts with a bang": http://onforb.es/1THyMGT

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How Far Can We Go? Limits of Humanity.

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http://www.youtube.com/timedtext_cs_panel?c=UCsXVk37bltHxD1rDPwtNM8Q&tab=2