Question: Two black holes in a binary system each have a mass of 4 MSun when they are well - separated. They subsequently merge due to

Two black holes in a binary system each have a mass of 4 MSun when they are well-separated.
They subsequently merge due to the emission of gravitational waves. After the merger, an astrophysicist
measures the mass of the new black hole and nds that it is less than 8 MSun. How can this be true?

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