Keen to sign up for space tourism? Here are 6 things to consider (besides the price tag)

It's been a momentous month for space-faring billionaires. On July 11, British entrepreneur Sir Richard Branson's Unity "rocket-plane" flew him and five fellow passengers about 85 kilometers above Earth. And this week, Amazon founder Jeff Bezos' New Shepard capsule reached an altitude of 106km, carrying Bezos, his brother, and the oldest and youngest people ever to reach such a height. Passengers on both flights experienced several minutes of weightlessness and took in breathtaking views of our ...