Anonymous

Because Mars' atmosphere is very, very, very diffuse.

Anonymous

Much thinner atmosphere and further away.

Anonymous

The density of Mars's atmosphere is much lower; Mars = .006 bar vs Venus = 92 bar of pressure at the surface of each. http://lasp.colorado.edu/~bagenal/3720/C...

Anonymous

Mars has a lot thinner Atmoshpnere most due to its Gravity, thus Mass Yenus has a really thick atmosphere replenished constantly by its Active Volcanoes Closer to the Sun its temperature would melt lead Hell on Earth it has been described as

Anonymous

much thinner atmosphere (Venus: 97 X Earth; Mars 0.008% Earth) and much further from Sun

Anonymous

It's the amount of CO2, along with distance that makes all the difference.

Anonymous

Mars is 4 times further from the sun than Venus, and while Mars has an atmosphere only 1/100th as thick as Earth's, it's only 1/9000th as thick as Venus' atmosphere - so, it has very little ability to retain the sun's heat.

Anonymous

because the atmosphere on Mars is very thin, unlike Venus.

Anonymous

Mars has hardly any atmosphere as its gravity isn't strong enough to keep it down.

Anonymous

It's much farther away from the sun.