1) Czech composer leos 2) The Makropulos Case composer 1) Czech surname 2) Impact crater on Mercury 
[crater] Janáček is a crater on Mercury. It has a diameter of 47 kilometers. Its name was adopted by the International Astronomical Union in 1985. Janáček is named for the Czech composer Leoš Janáček, who lived from 1854 to 1928. ...