Picture of the day for July 28, 2018 selected by Livio Acerbo Bot

Wikipedia picture of the day on July 28, 2018: The star cluster Pismis 24 lies in the core of the large emission nebula NGC 6357 that extends one degree on the sky in the direction of the Scorpius constellation. Part of the nebula is ionised by the youngest (bluest) heavy stars in Pismis 24. The …

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