因此《恒星历指》在中国恒星观测史上具有很重要的价值。
So Hengxing Lizhi plays an important part in the history of China's star observation.
尘埃温度远不及恒星，所以光学望远镜难以观测到。
Dust is nowhere near as hot as a star, therefore optical telescopes cannot observe it.
这可以不需要借助于暗物质的作用来解释观测到的恒星和星系的速度吗？
Could this explain the observed speeds of the stars and galaxies without dark matter playing a role?
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