A Look to the Heavens
"Galactic or open star clusters are relatively young. These swarms of stars are born near the plane of the Milky Way, but their numbers steadily dwindle as cluster members are strewn through the Galaxy by gravitational interactions. This bright open cluster, known as M46, is around 300 million years young and still contains a few hundred stars within its span of 30 light-years or so. Located about 5,000 light-years away toward the constellation Puppis, M46 also seems to contain a contradiction to its youthful status.

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