At the singularity of a black hole, light would theoretically experience extreme blue shift due to gravitational effects, potentially shifting green light into the gamma ray range. However, the understanding of conditions beyond the event horizon is highly speculative, and the existence of a true singularity is debated among physicists. Current theories may not fully account for the extreme gravitational forces at play. Thus, while the blue shift concept is plausible, it should be approached with caution given the limitations of existing knowledge. The nature of black hole singularities remains one of the most enigmatic topics in astrophysics.
