Galaxy cluster MACS J0717, composite image. This massive galaxy cluster was formed when four separate galaxy clusters collided. The hot gases in this image are colour-coded to show temperature, red gases are coolest, purple are hotter and blue are the hottest. The collisions are a result of a 13 million light year long stream of galaxies and other matter flowing into an already crowded region. The galaxy cluster is located 5.4 billion light years from Earth in the constellation Auriga. Image obtained by combining data from the Advanced CCD Imaging Spectrometer on the Chandra X-ray Observatory and the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on the Hubble Space Telescope.
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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