Why Mars looks red?

We now know that the mars atmosphere is mostly carbon dioxide. This color-causing gas is part of the Mars atmosphere because when the planet formed, there was much less carbon dioxide in the atmosphere than there is now. The carbon dioxide allows heat to escape from the planet into space, so Mars is much colder and appears red.

Why does the sun look red when setting?

It's not the sun itself that looks red, but the way light refracts through the atmosphere of the Earth.

Why does Mars look red?

The answer is two-fold: Mars has a thinner atmosphere than Earth, which means less light is reflected back at us. Also, Mars has a lot of dust covering its surface, which scatters light and makes it look red.

Why does Mars look red to us?

Mars is about half as far from the sun as the Earth is. That means Mars receives about half as much solar energy as the Earth. Mars also has only one-third of the amount of atmosphere the Earth does. This means less sunlight reaches the surface of Mars, and what does reach it is mostly absorbed by the ground. The few particles of light that do make it through the thin atmosphere are mostly reflected back off of Mars' dusty surface.

Why does Mars look red in the night?

Mars has two small red patches, called Phobos and Deimos, that move around Mars on an elliptical orbit. Because Mars is closer to the sun during the spring and summer, these two moons are closer to Mars than they are during the winter. This means that when Phobos and Deimos are close to Mars, they are closer to the sun than the red planet is. This means the moons are illuminated by the sun, making them appear red.