The color of Mars as seen in the sky is caused by the dominant red wavelengths in its spectrum, resulting from the iron oxides in Martian soil.
The color of Mars in our sky is determined by the dominant wavelengths of Mars's spectrum. The distinct red color we observe is due to the presence of iron oxides in its soil, which reflect red light more efficiently than other colors. These iron oxides can be linked to the various surface materials and atmospheric conditions that Mars possesses.
In historical contexts, this noticeable red hue is likely what associated Mars with war and blood in early cultural legends. However, through telescopes, we are unable to discern surface details beyond a certain resolution of about 100 kilometers, though we can observe the bright polar ice caps and changing surface markings seasonally, which adds to our understanding of the Martian environment.