# What ways are there for a black hole to lose its mass?

How can a black hole lose its mass? Is Hawking radiation the only way?

• They can also lose lass when they merge where the final mass is less than the combined mass of the initial black holes. – A. C. A. C. Nov 22 '17 at 19:45
• @JonCuster corrected) – user175077 Nov 22 '17 at 20:13

Hawking radiation is not the only way. Mass can also be lost in the form of gravitational waves since it takes energy to create these waves and energy is directly proportional to mass (times $c^2$).