https://academic.oup.com/ageing/article/37/3/251/40866
http://www.bbc.com/future/story/20150809-how-fast-could-humans-travel-safely-through-space
https://www.space.com/19915-milky-way-galaxy.html
https://medium.com/starts-with-a-bang/6-facts-you-never-imagined-about-the-nearest-stars-to-earth-9ffb3ea1ec62

Why Interstellar Travel Will Be Possible Sooner Than You Think

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