Las galaxias fantasma: girando en torno a las grandes galaxias como la nuestra parece haber miles de millones de extraÃ±os cuerpos celestes invisibles, hasta hace poco desconocidos por los cientÃficos.

Contenido | July 1, 2007| | Copyright

Son como espectrales cadÃ¡veres de antiguas galaxias que, tras haber perdido la mayor parte de sus estrellas y sus nubes de polvo y gas en violentos cataclismos, quedaron reducidas a una especie de despojos cÃ³smicos. Los astrÃ³nomos les llaman galaxias enanas esferoidales o galaxias oscuras y al parecer no son una rareza sino comunes y abundantes.

Salvo aquellas muy cercanas a nosotros no pueden verse, pues estÃ¡n formadas esencialmente por la famosa materia oscura que, como su nombre indica, no brilla. AdemÃ¡s contienen tan pocas estrellas a veces menos de 20 ...

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