What is the lecture mainly about？A．How astronomers found the correct interpretation for a

What is the lecture mainly about？

A．How astronomers found the correct interpretation for a certain observation

B．How astronomers distinguish between two kinds of nebulae

C．Various improvements to the telescope over the last 300 years

D．An old problem in astronomy that remains unsolved

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

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