blackhole mass

 Black holes can have a wide range of masses, from a few times that of the Sun to several billion times. The mass of a black hole is one of the most important factors that determine its properties, such as its size, event horizon, and gravitational pull. Astronomers can measure the mass of a black hole by observing its effects on nearby objects, such as stars, or by studying the motion of stars and gas in the vicinity of a black hole. The largest known black hole is located in the center of the galaxy NGC 4889 and has a mass estimated to be around 21 billion times that of the Sun.