Key to life
"We don't want to have so many medical restrictions that no one can fly, but we want to make sure we truly understand the effects of these flights.
"There has to be a balance between medical safety and the industry flourishing - more information will help us find this balance."
The study of human physiology in space benefits more than just budding space tourists and astronauts though.
There are distinct similarities between the effects of lengthy space travel on humans and the effects of ageing on Earth.
"Astronauts' bones become weaker and their physical fitness decreases the longer they spend in space, much like an elderly person leading a sedentary lifestyle," says Dr Green.
"We can learn a lot about the fundamental mechanics of how to stay alive on Earth from going into space."
Increased access to space will bring challenges for medical experts and scientists alike as they attempt to minimise the side-effects of space travel for the general public while promoting the exhilaration of floating in microgravity.