  Here we report targeted high-pressure synthesis of two novel high-$T_C$
hydride superconductors, $P6_3/mmc$-$ThH_9$ and $Fm\bar{3}m$-$ThH_{10}$, with
the experimental critical temperatures ($T_C$) of 146 K and 159-161 K and upper
critical magnetic fields ($\mu$$H_C$) 38 and 45 Tesla at pressures 170-175
Gigapascals, respectively. Superconductivity was evidenced by the observation
of zero resistance and a decrease of $T_C$ under external magnetic field up to
16 Tesla. This is one of the highest critical temperatures that has been
achieved experimentally in any compounds, along with such materials as
$LaH_{10}$, $H_3S$ and $HgBa_2Ca_xCu_2O_{6+z}$. Our experiments show that
$fcc$-$ThH_{10}$ has stabilization pressure of 85 GPa, making this material
unique among all known high-$T_C$ metal polyhydrides. Two recently predicted
Th-H compounds, $I4/mmm$-$ThH_4$ (> 86 GPa) and $Cmc2_1$-$ThH_6$ (86-104 GPa),
were also synthesized. Equations of state of obtained thorium polyhydrides were
measured and found to perfectly agree with the theoretical calculations. New
phases were examined theoretically and their electronic, phonon, and
superconducting properties were calculated.
