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IN SPACE - MARCH 17: (EDITORIAL USE ONLY) (NO SALES) In this handout image supplied by the European Space Agency (ESA), ESA astronaut Tim Peake poses in an 'Unlimited Space Agency' t-shirt on the International Space Station, March 17, 2016. ESA astronaut Tim Peake is performing more than 30 scientific experiments and taking part in numerous others from ESA's international partners during his six-month mission, named Principia, after Isaac Newtons ground-breaking Naturalis Principia Mathematica, which describes the principal laws of motion and gravity. (Photo by ESA/NASA via Getty Images)

IN SPACE - MARCH 17: (EDITORIAL USE ONLY) (NO SALES) In this handout image supplied by the European Space Agency (ESA), ESA astronaut Tim Peake poses in an 'Unlimited Space Agency' t-shirt on the International Space Station, March 17, 2016. ESA astronaut Tim Peake is performing more than 30 scientific experiments and taking part in numerous others from ESA's international partners during his six-month mission, named Principia, after Isaac Newtons ground-breaking Naturalis Principia Mathematica, which describes the principal laws of motion and gravity. (Photo by ESA/NASA via Getty Images)
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