Stanford astrophysicists report first detection of light from behind a black hole:
https://news.stanford.edu/stories/2021/07/first-detection-light-behind-black-hole
Similarities and differences between coronal holes and the quiet Sun: Are loop statistics the key? T. Wiegelmann and S. K. Solanki, Max-Planck Institute: https://www2.mps.mpg.de/homes/wiegelmann/twsks04.pdf
Corona references to consider and compare: Eye, Sun, Black hole
- Associated with a central object: All three “coronas” are associated with a central object or a point of focus (the eye’s lens/light source, the Sun, the black hole).
- Less dense/tangible (relatively): Compared to the core of the Sun or the density within the eye’s lens, the solar corona is a tenuous atmosphere, and the black hole corona is also described as a region of plasma.
- “Halo-like” appearance (in certain contexts): The solar corona and the ciliary corona of the eye can be perceived as “halos” or “crowns” around a central object (the Sun during an eclipse, and a bright light for the ciliary corona).