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martes, 16 de julio de 2013

NASA | LOS COMETAS QUE SURCAN EL SOL: What is a Sungrazing Comet?: LA TRAYECTORIA DE COMETAS ORBITA AL REDEDOR DEL SOL

VIDEO: LOS COMETAS QUE SOBREVIVEN AL SOL: ORBITA TRAYECTORIA
Sungrazing comets are a special class of comets that come very close to the sun at their nearest approach, a point called perihelion. To be considered a sungrazer, a comet needs to get within about 850,000 miles from the sun at perihelion. Many come even closer, even to within a few thousand miles.