Bootes constellation. This constellation contains the fourth brightest star in the night sky, Arcturus (Alpha Bootis, lower right), although the third brightest, Alpha Centauri, is only third as it contains two bright stars that are indivisible with the naked eye. As a single star, Arcturus is the third brightest visible in the night sky. Bootes, the bear keeper, forms an elongated kite figure stretching from Arcturus to upper centre. At centre left is the constellation Corona Borealis, the northern crown. This is a small arc of stars centred on the blue star Gemma, or Alphecca (Alpha Coronae Borealis).
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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