Asteroid impact on Mars, computer artwork. Mars is the fourth planet from the Sun. It is scarred by around 43,000 impact craters that have a diameter of over 5 kilometres. There are far fewer craters on Mars compared with the Moon (despite being nearer the asteroid belt) because Mars has a thin carbon dioxide atmosphere, which provides some protection. The orange colour is due to the iron oxides in the rocks.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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