A new study by a Belgian team using data from the European Southern Observatory's Very Large Telescope has shown that iron and nickel exist in the atmospheres of comets throughout our Solar System, even those far from the Sun. A separate study by a Polish team, who also used ESO data, reported that nickel vapor is also present in the icy interstellar comet 2I/Borisov. This is the first time heavy metals have been found in the cold atmospheres of distant comets.