Neutron star. Artwork of a neutron star. This super-dense astronomical object is the remains of a massive star that has collapsed under its own gravity. The star is as dense as an atomic nucleus, having a mass of up to three times that of the Sun despite being only around 25 kilometres across. The star is composed mainly of neutrons, formed when protons and electrons are forcibly combined during the collapse. Neutron stars rotate extremely rapidly, up to several thousand times per second and are extremely hot, with surface temperatures in the millions of degrees Celsius. Some neutron stars produce regular beams of radio emissions known as pulsars.
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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