<https://zh-tw.coursera.org/lecture/black-holes-astro-101/04-01-introduction-sizing-up-black-holes-r1jZ7#lecture>
<http://schema.org/description>
"Watch this video about 04.01 – Introduction: Sizing up Black Holes for Sizing Up Black Holes in Astro 101: Black Holes. So far discussion has focussed on either the general case for black holes, of the stellar mass variety (endpoint of a star's life). In this module students will explore the various sizes of black holes and their measurable properties. Students will learn that there are four major types of astrophysical black holes (primordial/mini black hole’s, stellar mass, intermediate mass and supermassive black holes),  and discover current theories on their formation, and what might feed them. Students will also gain an knowledge of ‘no-hair’ theorem and gravitational lensing. We will also explore the formation of supermassive black holes, intermediate mass black holes, and mini black holes in particle accelerators. "
<https://zh-tw.coursera.org/lecture/black-holes-astro-101/04-01-introduction-sizing-up-black-holes-r1jZ7>