We can confirm that the most likely reason for astronomers to see differences in the stars they observe is that stars are at different points in their life cycles.
Stars are said to have seven phases to their lives, which include them being:
Each of these phases of a star have vastly different characteristics and can explain the differences in the observations made by the astronomers.
Therefore, we can confirm that option 2 is correct in that the differences seen by the astronomers are likely because stars are at different points in their life cycles.
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