<https://zh-tw.coursera.org/lecture/black-holes-astro-101/04-01-introduction-sizing-up-black-holes-r1jZ7#lecture>
<http://schema.org/transcript>
"Black holes represent spacetime that is so warped, light itself is unable to climb beyond the event horizon. The properties of a black hole depend on its mass and its spin. Observations of black holes support a categorization system that divides black holes by mass: stellar mass, intermediate mass, and supermassive black holes. The black hole categories reflect the environments where the black holes live and the way these black holes form. Stellar mass black holes form from the collapse of a star. Less is known about the formation of intermediate and supermassive black holes. The stellar mass black holes may act as the seeds for larger black holes that grow as other stars and black holes collide and merge. Let's explore the characteristics of each category of black hole."
<https://zh-tw.coursera.org/lecture/black-holes-astro-101/04-01-introduction-sizing-up-black-holes-r1jZ7>