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Last week we covered multiple star systems, but what if we added thousands or even millions of stars to the mix? A star cluster. There are different kinds of clusters, though. Open clusters contain hundreds or thousands of stars held together by gravity. They’re young, and evaporate over time, their stars let loose to roam space freely. Globular clusters, on the other hand, are larger, have hundreds of thousands of stars, and are more spherical. They’re very old, a significant fraction of the age of the Universe itself, and that means their stars have less heavy elements in them, are redder, and probably don’t have planets (though we’re not really sure).
Първа ефирна дата : Jan 15, 2015
Дата на последния ефир : Dec 24, 2015
Епизод : 46 Епизод
Сезон : 1 Сезон
Времетраене: 12 минути
Студио: YouTube
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В ролите: Phil Plait
Екипаж: Phil Plait (Writer)
