![The M31 Galaxy, more commonly known as the Andromeda Galaxy, is a spiral galaxy situated some 2- 2.5 million light years from us in the direction of the constellation of Andromeda. Credits: Adam Evans/wikipedia. The M31 Galaxy, more commonly known as the Andromeda Galaxy, is a spiral galaxy situated some 2- 2.5 million light years from us in the direction of the constellation of Andromeda. Credits: Adam Evans/wikipedia.](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/reportajes75_115_hi.jpg?itok=8pdfGI8W)
The discovery of metal-rich planetary nebulae in the outer regions of the Andromeda Galaxy, using data from the GTC, gives evidence of a possible encounter between galaxies
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