Chris Hadfield/NASA A geologic dome in the Sahara Desert called the Richat Structure.
When retired Canadian Space Agency astronaut, Chris Hadfield, was aboard the International Space Station for the final time, he made the most of it.
From December 2012 to May 2013, Hadfield orbited Earth 2,597 times and took nearly 45,000 photographs of Earth from the International Space Station. His Twitter stream of photos catapulted him to popularity - he now has more than a million followers.
Hadfield compiled some of his favorite photographs in his new book "You Are Here: Around the World in 92 Minutes."
In the book's introduction he writes about Earth: "You are here - we all are - for life. Let's get to know the place a little better." With these stunning images he captured of our planet, you can.