The double open clusters NGC 884 (left) and NGC 869 in the constellation Perseus. They occupy a wide area approximately the size of three full moons in the sky, making them visible to the naked eye in dark places without light pollution.
The stars within the two clusters are much younger and hotter than the Sun, and based on the age of the stars, the clusters are only about 13 million years old. This suggests that these clusters may have formed together in the same stellar birthplace.
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