What assumption can a stargazer reasonably make about stars visually embedded within a nebula or star cluster?

Answer

They are likely at a similar distance to the cluster or nebula

Stars that appear visually grouped within a cluster or nebula share a common gravitational association and formation history, implying they are physically near each other in three-dimensional space.

What assumption can a stargazer reasonably make about stars visually embedded within a nebula or star cluster?

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How Far Are The Nearest Stars? - YouTube

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