Galaxia de Andrómeda

La galaxia de Andrómeda es una galaxia espiral gigante que contiene aproximadamente un billón de estrellas. Es el objeto visible a simple vista más lejano a la Tierra. Es más grande y brillante que otras galaxias como la Vía Láctea y la Galaxia del Triángulo.

Andrómeda se está acercando a nuestra galaxia a unos 300 kilómetros por segundo y se cree que de 3.000 a 5.000 millones de años podrían colisionar y fusionarse ambas formando una galaxia elíptica supergigante.

La primera referencia existente a la galaxia de Andrómeda data del año 961, y fue hecha por el astrónomo persa Azophi, que en su 'Libro de las Estrellas Fijas' la describe como una "nube pequeña en la constelación de Andrómeda".

La primera observación telescópica corresponde a Simon Marius en 1612. En 1764, Charles Messier la incluye en su catálogo con el número 31. William Herschel observó en su región central un débil brillo rojizo, pensando que era la más cercana de las 'grandes nebulosas'.

En 1925 Edwin Hubble encontró estrellas en fotografías de Andrómeda con lo que la 'Nebulosa de Andrómeda' pasó a ser conocida definitivamente como la 'Galaxia de Andrómeda'.

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