Halley's comet

Numéro d’image : 12072057
Halley's comet
Halley's comet. Optical image of Halley's Comet. Halley's comet is a huge ball of evaporating ice and dust that follows a highly elliptical orbit around the Sun,becoming visible from Earth every 76 years. In the centre of the comet's head is an icy nucleus about 16km long. The Sun's heat boils away the surface of the nucleus,producing an enormous cloud of dust and gas far larger than any of the Solar System's planets. Part of this cloud is swept backwards by the Sun's radiation and solar wind (a stream of charged particles) to form a tail millions of kilometres in length. The comet is named after Edmond Halley (1656-1742),who discovered its 76-year orbit
Licence : Droits gérés
Crédit: Science Photo Library / Lodriguss, Jerry
Taille de l’image : 4639 px × 3116 px
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Property Release : Non requis
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