The colour of this rust can change slightly, from red to brown to orange, and Dr Meyer thinks these changing colours may have worried ancient astronomers who believed Mars was immutable, or never changing.
这种铁锈的颜色会让火星的颜色从红色轻微变化到棕色再到橙色,而且迈耶博士认为这些颜色的变化可能会让那些认为火星永恒或永不变化的古代天文学家感到担忧。