![]() Taking us through yearly cycles of summer and winter. 'At this pace we can see how the southern and then northern hemispheres are angled towards the warmth of the sun. To see how that works we need to speed time up, so a year passes in just ten seconds. And we have seasons because the Earth's axis is tilted by 23 degrees. A year is the time it takes to orbit the sun. It carries us through cycles of night and day, as it turns on it's axis every 24 hours. Something you get a sense of in this clip from Professor Brian Cox, which takes in, not just our own planet, but also looks at where it sits alongside the other planets in our solar system. Looking down on the Earth from the ISS gives you a completely new perspective on the planet. ![]() And from December 2015 to June 2016, I spent six months orbiting Earth on the International Space Station. I'm an astronaut based here at the European Space Agency, in Germany.
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