Flag of Mars

[4] Pascal Lee, a former NASA research engineer designed a tricolor flag for Mars in 1999.

The sequence of colors, from red, to green, and finally blue, represent the transformation of Mars from a lifeless planet to one teeming with life, as inspired by Kim Stanley Robinson's Mars trilogy of novels.

In the 2011 book Leviathan Wakes by James S. A. Corey, the first part of The Expanse series, the flag of Mars is described as depicting the "lonely star, and thirty stripes".

[8] However, in the 2015 The Expanse television series, based on The Expanse novel series, the flag of the Martian Congressional Republic (the governing body that rules over the inhabitants of Mars) is divided horizontally into two equal stripes: orange on top, and black on the bottom.

In the centre is placed a hollow red circle, symbolizing Mars, with a thin blue crescent attached to its left inner side, symbolizing the terraforming effort, and the limited resources of water and oxygen of the planet's population.