Colliding galaxies. Supercomputer simulation showing the gas content of two colliding spiral galaxies. Temperature is represented by colour, blue (coolest) to red (hottest). Brightness represents density. Two galaxies approach and merge (top pair), then separate (second pair), before merging into a large elliptical galaxy (bottom). During the merger, gravity drives gas into the centre, causing a burst of new star formation. The incoming gas also feeds a supermassive black hole which is thought to power a quasar. The black hole increases in mass until it releases enough energy to heat the gas and expel it into space. As the new galaxy is gas- poor, little new star formation occurs. Simulation created in 2005 at the Max Planck Institute for...
About the Artist - Tiziana Di Matteovolker Springellars Hernquist
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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