Halley's Comet. Halley's Comet orbits the Sun every 76 years. This periodicity was discovered by Edmund Halley (1654-1742),after whom the comet is named. Comets are balls of ice and dust form the solar system. Heat from the Sun evaporates the ice,forming a tail. This tail,which because of solar wind always points away from the Sun,can be many millions of kilometres long and very bright. Photographed from Melbourne Observatory,Australia on 18 April 1910 | |
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Crédit: | Science Photo Library / Royal Astronomical Society |
Taille de l’image : | 4908 px × 3903 px |
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