Einsteins theory of relativity means that the twin will return from space younger than his brother. However, as it is impossible to study the flow of time, in this experiment, NASA will instead be testing 10 research proposals to study the twins' genetics, biochemistry, vision, cognition.

We will be taking samples and making measurements of the twins before, during, and after the one-year mission.

For the first time, we'll be able two individuals who are genetically identical.

Each proposal is fascinating and could be a feature-length story of its own.

We already know that the human immune system changes in space. It's not as strong as it is on the ground.

In one of the experiments, Mark and Scott will be given identical flu vaccines, and we will study how their immune systems react.

Other tests will examine DNA ageing, the effects of space travel on vision, and the stomachs inner bacteria.

The experiment will be conducted in March 2015.

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NASA conducts Einstein-esque paradox twin experiment