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 _    _    _    _    _    _      ___      ______  
| |  | || | || | || | || | ||   / _ \\   /_   _// 
| |/\| || | || | || | || | ||  | / \ ||  `-| |,-  
|  /\  || | \\_/ || | \\_/ ||  | \_/ ||    | ||   
|_// \_||  \____//   \____//    \___//     |_||   
`-`   `-`   `---`     `---`     `---`      `-`'

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發送短信 : Kerr black hole surrounded by dark matter: Horizon, photonosphere and shadow