黑洞：太空邊緣

 Topics: Gravity, spacetime curvature, and general relativity.

Content: Explanation of gravity, spacetime, and Einstein’s theory of general relativity using the couch cushion analogy. 

 Topics: Density, neutron stars, escape velocity, and black hole formation.

Content: Comparison between sun, neutron stars, and black holes in terms of density and their effect on spacetime curvature. 

Explanation of escape velocity, how black holes form, and the concept of the event horizon. 

 Topics: Singularity, event horizon, accretion disk, stellar black holes, supermassive black holes, and hypothetical black holes.

Content: Detailed discussion on the parts of a black hole including the singularity, event horizon, accretion disks, and jets.

Discussion on stellar and supermassive black holes, and the potential existence of primordial and intermediate black holes. 

 Topics: Star formation, lifecycle, and black hole formation.

Content: Detailed description of how stars form, evolve, and some turn into black holes through supernovae.