Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Globular Cluster NGC 1818

球状星团NGC 1818

Globular Cluster NGC 1818
(credit NASA,The Hubble Space Telescope )

NGC 1818 is a very young globular cluster located in the Large Magellanic Cloud. Based on the populations of the different spectral classes of stars, it is estimated to be only about 20 million years old, compared to ages of about 13 billion years for globular clusters in the Milky Way.

NGC 1818是一个位于大麦哲伦星云中的非常年轻的球状星团。根据不同光谱型星体的分布，估计其年龄仅约为2000万年，而银河系中的球状星团年龄约为130亿年。
球状星团NGC 1818（资料来源：NASA，哈勃太空望远镜）
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