open cluster

基本解釋

Hence, it is rare that an open cluster survives long enough for one of its members to form a planetary nebula.
因此，一個疏散星團很少能夠存活到它內(nèi)部的某個成員變成行星狀星云。
The stars will win in the end, destroying their pillars of creation over the next 100, 000 years, and resulting in a new open cluster of stars.
恒星將取得最終勝利，接下來的10萬年恒星將摧毀它們的創(chuàng)造之柱，結(jié)果形成一個新的疏散星團。
When the watercolor-like cloud surrounding the open cluster of stars was first observed, it was thought to be leftover material from the formation of the cluster.
這種圍繞在恒星疏散星團周圍的水彩狀氣體云是第一次被觀測到，一般認為這種氣體云是恒星群形成后的剩余物質(zhì)。

But at a nearby school, we are shown what Calacharo says is the norm, a small cluster of putrid open-pit latrines made of mud bricks worn to mere shells by rain and lack of repair.
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