The mass of black holes is determined using the stars and dust surrounding them by an indirect method.

Astronomy studies the planets, solar system, galaxies, stars, nebulae, comets, asteroids, black holes, quasars and meteors among many objects in the universe or cosmos. In the same way, cosmology studies the birth, existence and end of the universe. astrophysics uses the laws of physics and chemistry to study the cosmos and how we adapt to it.

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