题目

ASTR-1-45046-F25 Lecture: The Stellar Circle of Life

匹配题

Match the description with the letter. 1: Which star is most like our Sun? 2: Which star will have changed the least 10 billion years from now? 3: Which star could be no more than a few million years old? 4: Which star is NOT fusing hydrogen into helium in its core?

选项

A.A

B.D

C.C

D.B

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标准答案

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思路分析

We are given a matching question with descriptions labeled 1 through 4 and lettered options A, B, C, D to match. The correct mapping provided is: 1 -> B, 2 -> C, 3 -> A, 4 -> D. I will explain the reasoning for each description and why the chosen letter is correct, as well as why the other letters would be incorrect. Description 1: Which star is most like our Sun? - Correct choice: B - Why B is correct: The Sun is a G-type main-sequence star (a relatively middle-aged, middle-temperature, hydrogen-burning dwarf). Among typical HR diagram positions, a star that is a mid-range in both temperature and luminosity best resembles the Sun. Option B sits along the main-sequence band near solar-like properties, making it the closest match to our Sun. - Why the other options are not correct: - A would correspond to a star with higher temperature and luminosity ......Login to view full explanation