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IN SPACE - JANUARY 23: (EDITORIAL USE ONLY) (NO SALES) In this handout image supplied by the European Space Agency (ESA), The ISS passes over Italy, the Alps and the Mediterranean, in an image taken by British ESA astronaut Tim Peake from on board the International Space Station, January 23, 2016. Tim Peake's six-month mission to the International Space Station is named Principia, after Isaac Newton's ground-breaking Naturalis Principia Mathematica, which describes the principal laws of motion and gravity. (Photo by Tim Peake / ESA via Getty Images)

IN SPACE - JANUARY 23: (EDITORIAL USE ONLY) (NO SALES) In this handout image supplied by the European Space Agency (ESA), The ISS passes over Italy, the Alps and the Mediterranean, in an image taken by British ESA astronaut Tim Peake from on board the International Space Station, January 23, 2016. Tim Peake's six-month mission to the International Space Station is named Principia, after Isaac Newton's ground-breaking Naturalis Principia Mathematica, which describes the principal laws of motion and gravity. (Photo by Tim Peake / ESA via Getty Images)