\begin{document}${\rm M87}^\star$\end{document}, the Hubble constant can be independently determined with a precision of about 13% as \begin{document}$H_0=70\pm 9$\end{document} km \begin{document}${\rm s}^{-1}$\end{document} \begin{document}${\rm Mpc}^{-1}$\end{document}. The high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters \begin{document}$H_0$\end{document} and \begin{document}${\Omega_{m}}$\end{document}, and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters."> A new cosmological probe using super-massive black hole shadows -
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