The crew will have to spend hours out of their day to avoid the physical problems of microgravity.
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As the 727 crested and descended each parabola, it created a microgravity environment that lasted about 30 seconds.
Dr Evetts says that researchers putting proposals to the European Space Agency are aware that microgravity research is a long haul.
One of the risks of living in microgravity conditions is that bones tend to lose strength over time.
As it turned out, Nefertiri was able to adapt to microgravity and was successful at catching its own food.
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The craft could be modified to launch microsatellites, and Virgin hopes to sell flights to agencies for microgravity or atmospheric experiments.
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It was flown and consumed on the International Space Station because if fulfilled all the nutritional and microgravity requirements for NASA astronauts.
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Without taking up valuable space or weight during missions, X1 could replicate common crew exercises, which are vital to keeping astronauts healthy in microgravity.
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But while Logan cautions that although the act of ejaculation would likely not be impeded in space, microgravity would do nothing to enhance it.
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The company is also developing a bespoke 3D printer called MicroGravity Foundry for the purpose, it said, and hopes to be ready to start production by 2020.
It was a programme that included engineering familiarisation, medical, survival and robotics training as well as microgravity or "zero-g" flights and sessions in a giant pool practising spacewalking.
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The new project will send a strain of bacteria called Bacillus Subtilis into space to see if introducing different nutrients or compounds in the microgravity environment could block its growth.
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.
California's XCOR Aerospace also is developing a reusable vehicle that will take a pilot and a front-seat customer to the edge of space -- for pleasure or to transport scientific payloads that would benefit from microgravity.
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Microgravity could even make conception more difficult.
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Passengers will ride the rocket plane for the fun of it, but scientists would use it for the same reasons they also fly experiments on the International Space Station (ISS) or on sounding rockets - to access microgravity conditions.
That means Mars-bound astronauts will also have to skip out on the ground-based psychological support sessions that astronauts and cosmonauts working on the international space station routinely have just to make sure microgravity has not gone to their heads (Before Soviet cosmonaut Yuri Gagarin became the first man in space in 1961, experts were afraid weightlessness might cause schizophrenia, explained one doctor).
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