Astronaut Scott Kelly on the devastating effects of a year in space

I think a real takeaway from this article is that long distance space travel will not be truly realistic until we have a way to simulate earth’s gravity on a ship. There are numerous approaches to this as any hard sci-fi novel will tell you, but how far away exactly are we from creating something like this in real life?

I think an important open question is how much gravity is enough. Will Mars&#x27;s 0.38g be enough for colonists? How about the Moon&#x27;s 0.165g? These are critical questions we need to answer to know how practical it will be to have colonies on those worlds. The only choice my be to breed humans for those conditions. Homo ares and Homo luna.<p>Venus is such a tragedy. Surface gravity of 0.9g, probably quite livable, but the surface is Hell.

A guinea pig speaks! &quot;It&#x27;s not all fun and games being a guinea pig.&quot; Great story, I&#x27;m looking forward to reading the book this is excerpted from.<p>Granted that this is a first person account, still, this is what heroism looks like. Thank you for your service, Captain Kelly.