I think it's pretty standard to consider the photon sphere(s) as just a specific location with relevance to the optics of black holes. The region is...
The trick is not to care about "messy". The six-month haircut cycle requires long periods sporting what most people would consider "messy hair", but...
People ask "why" when they don't have an answer to the question posed. If they have some sort of response, that makes it an interesting question, and...
Search for "sugar glass" recipes. You make it from a mixture of glucose and sucrose in solution, and you need to get the ratio just right to produce...
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