M101: The Pinwheel Galaxy M101: La Galaxia Molinete
Why do many galaxies appear as spirals? A striking example is M101, shown above, whose relatively close distance of about 22 million light years allow... ¿Por qué muchas galaxias presentan forma espiral? Un ejemplo notable es M101, mostrada arriba, cuya distancia relativamente cercana de unos 22 millone...