Bibliography:

All information and images from NASA and EHT websites.

https://imagine.gsfc.nasa.gov/science/objects/black_holes1.html
https://imagine.gsfc.nasa.gov/educators/lessons/xray_spectra/background-lifecycles.html
https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html
https://imagine.gsfc.nasa.gov/science/objects/supernovae2.html
https://imagine.gsfc.nasa.gov/science/objects/dwarfs1.html
https://www.nasa.gov/vision/universe/starsgalaxies/black_hole_description.html

Images:
https://www.jpl.nasa.gov/images/black-hole-grabs-starry-snack-artist-concept
https://www.nasa.gov/sites/default/files/thumbnails/image/simulated_bh.jpg
https://www.jpl.nasa.gov/images/the-colorful-demise-of-a-sun-like-star
https://www.nasa.gov/feature/goddard/2021/hubble-uncovers-concentration-of-small-black-holes
https://eventhorizontelescope.org/press-release-april-10-2019-astronomers-capture-first-image-black-hole