http://apod.nasa.gov/apod/image/1009/aurora_salomonsen_big.jpg

http://apod.nasa.gov/apod/fap/image/1109/m42_vargas_900.jpg

http://apod.nasa.gov/apod/fap/image/1108/fairypillar_hst_900.jpg

Surse: aici, aici și aici.

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