If an astronomer calculates a minimum mass for an unseen companion that exceeds $3 M_ ext{sun}$, what is strongly suggested about that unseen object?
Answer
It is likely a black hole
Since the maximum mass for a neutron star is thought to be around 2 to $3 M_ ext{sun}$, a calculated lower mass limit exceeding this threshold suggests the unseen object must be more massive, indicative of a black hole.
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