mars
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Mars is the planet in the solar system that appears reddish brown due to its iron-rich surface, which gives it its distinctive coloration.
Jupiter: See related link for a picture.
Mars is often referred to as the "red planet" due to its reddish-brown color caused by iron oxide (rust) on its surface. It is a barren desert planet with rocky terrain and little to no water.
Mars has long been called the RED planet because of how it appears in earths night sky.Mars is actually brown- NASA used filters to change the colour to red. --- To the naked eye, Mars usually appears a distinct yellow, orange, or reddish color, and varies in brightness more than any other planet as seen from Earth over the course of its orbit. However the actually colour of Mars is closer to butterscotch, the redness seen is actually just dust in the planets atmosphere; considering this NASA's Spirit rover has taken pictures of a greenish-brown, mud-coloured landscape with blue-grey rocks and patches of light red coloured sand." From:- The Book of General Ignorance,
Iron oxide is a reddish-brown compound commonly referred to as rust. Polar ice caps are regions of a planet's surface where ice permanently accumulates. The presence of iron oxide in polar ice caps can give them a reddish color, like the red snow in Antarctica caused by iron-oxidizing bacteria.
No, Jupiter is not a brown dwarf. Jupiter is the largest planet in our solar system and is classified as a gas giant. Brown dwarfs are substellar objects that are larger than planets but smaller than stars, and they do not have enough mass to sustain nuclear fusion in their cores like stars do.