与太阳系最为相像的是大熊座47行星系，大熊座47是一颗太阳型恒星，比太阳稍微老一点。

The system most like the Solar System (so far) is that of 47 Ursae Majoris (47 UMa) - a solar-type star, a bit older than the Sun.

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一个完整的MK系统代号包含光谱类型和光度型两部分——例如，太阳属于G 2 V类恒星。

A complete MK designation includes both spectral type and luminosity class -for instance, the sun is a G2V.

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本文综述有关晚型恒星中的类太阳活动的研究进展。

This paper gives a review of research advances of the solar-like activities in late-type stars.

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本文综述有关晚型恒星中的类太阳活动的研究进展。

This paper gives a review of research advances of the solar-like activities in late-type stars.

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