Nuclear fusion reactions, computer artwork. These three reactions are being investigated for use in fusion power. Protons are red and neutrons blue. The relative amount of energy produced by a reaction is shown by the size of the pink flare at right. The top reaction is the D-T fuel cycle. A deuterium (D) nucleus fuses with a tritium (T) nucleus, forming a helium (He-4) nucleus and a free neutron. At centre is the D-He3 fuel cycle, in which D fuses with a He-3 nucleus, forming a helium nucleus and a proton. At bottom is the D-D fuel cycle, where two D nuclei fuse to produce He-3 and a neutron. D-T is the easiest, D-He3 produces the most energy. These reactions will be tested by the ITER project, scheduled to begin in 2016.
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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