We propose CANOPUS method, which is innovative rapid cooling and liquid atomization process utilizing a sustainable small-scale spontaneous vapor explosion with a vapor explosion promoter as a quenchant. In this manner, one can utilize vapor explosion securely and efficiently to produce the fine amorphous powder. The cooling rate of the CANOPUS method is up to 1.5·108 K/s, which is 280 times higher than that of the conventional water atomizing and is thousands times higher than that of the widely-used gas atomizing. CANOPUS method was successfully applied to a highly viscous (18 Pa s) Mora coal gasification slug, resulting in 30 m powders, which can be used for one of the raw materials of cement. CANOPUS process produces the following highly functional powders: (1) homogeneous materials without segregation, (2) amorphous powders, (3) powders with control grain boundary size, and (4) fine-scale powders. The CANOPUS method allows us to produce new functional materials with excellent tenacious, corrosion resistant, and soft magnetic properties for more practical use, which was difficult to amorphize and control grain boundary size by the other cooling methods so far.