Space Station ports only in the news when something goes wrong or when Chris Hadfield plays guitar, says Martin Rees told CNN.

The bantering commentary aims, the British research profile of astronaut Hadfields interpretation of David Bowie's "Space Oddity" from the International Space Station.

According to him, it is no longer cost effective to keep people in space and not to any particular benefit to science.

- Space travel should be given to adventurers who are willing to take a higher risk, says Rees and the private company SpaceX and Blue Origin in mind.

Of course, he met with opposition from the ESA.

In a statement to CNN writes boss David Parker ESA believes that manned space provides "excellent value for money".

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