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Image Credit:  Event Horizon Telescope   Collaboration Explanation:  What does a black hole look like? To find out,  radio telescopes  from  around the Earth  coordinated observations of  black holes  with the largest known  event horizon s on the sky. Alone, black holes are just  black , but these monster attractors are known to be surrounded by glowing gas. The first image was released yesterday and  resolved  the area around the  black hole  at the center of  galaxy M87  on a scale below that expected for its  event horizon .  Pictured , the dark central region is not the event horizon, but rather the  black hole's shadow  -- the central region of emitting gas darkened by the central black hole's gravity. The size and shape of the shadow is determined by bright gas  near the event horizon , by strong  gravitational lensing deflections , and by the black hole's spin. In resolving  this black hole's shadow , the  Event Horizon Telescope  (EHT*) bolstered evidence

I ( Dr. Carol JVF Burns , actual owner of this page) prepared this page to thoroughly familiarize myself with the $\rm\TeX $ commands that are available in MathJax, and to provide a resource that may be useful to other MathJax users. Davide Cervone, the lead developer of MathJax, has most generously provided extensive edits, and this page is greatly improved due to his efforts; I owe him countless thanks. All mistakes on this page are my own (and I welcome suggestions and corrections). Please contact me via the contact form on my homepage . MathJax allows a syntax modeled on both $\rm\TeX $ and $\rm\LaTeX $. Therefore, web authors can use familiar and concise commands when creating mathematics with MathJax. Know the shape of a character that you want, but not its name? Draw it here! symbols # indicates numbered arguments in definitions