Hello, is this planet Earth? takes readers on a mesmerizing tour of Tim's historic and inspirational six-month Principia mission. Based on over 150 of Tim's stunning photographs that he took on board the international space station, many of which have not been seen before, this lavish collection showcases the beauty of earth from above, and is the perfect visual time capsule of Tim's remarkable trip, which captured the imaginations of millions of children and adults across the world.