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What is the effect of a cold?

Why is Mars cold if its atmosphere consists of 95% carbon dioxide? Where is the greenhouse gas effect?

  • Gliese comparised to Mars On average, the light that Gliese 581 d receives from its star has about 30% of the intensity of sunlight on Earth. By comparison, sunlight on Mars has about 40% of the intensity of that on Earth. That might seem to suggest that Gliese 581 d is too cold to support liquid water and hence is inhospitable to life. However, an atmospheric greenhouse effect can significantly raise planetary temperatures. If the atmosphere of Gliese 581 d produces a sufficiently large greenhouse effect, then the surface temperature might well permit liquid water and the planet might conceivably support life. Gliese 581 d is speculated that it is an icy planet that has migrated closer to the star, ice has melted and therefore it is made of solid rocky material with a solid rocky surface Mars If you have read about Gliese 581 D, explain me. We know the atmosphere of Mars consists of 95% carbon dioxide. So does the atmosphere of Venus. While Venus is the hottest planet in our solar system because it has this 95% carbon dioxide atmosphere that creates greenhouse effect, Mars, which has the same atmosphere like Venus, is a cold planet. Where is the greenhouse effect that should be on Mars?

  • Answer:

    'cause Mars has a low pressure ; nearly 1/100 terrestrial atmosphere .It's not sufficient to warm it. Venus got 9,000 kPa on its surface .

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Because the atmosphere on Mars is so thin that it can't retain any heat. The atmosphere on Venus, on the other hand, is very dense. .

aladdinwa

Mars has 95% carbon dioxide, but the total atmospheric density is incredibly low. In fact, the atmospheric pressure on Mars is so low that it would be considered a good vacuum if you could produce it in a laboratory! 95% of a very small number is an even smaller one. There just is not enough carbon dioxide on Mars to create such a greenhouse effect.

Jason T

The Martian atmosphere is too thin to store much solar heat.

wilde_space

on mars; 6 mb pressure is so low that h2o can only be in a gas or solid form (ideal gas law). ice sublimates directly into a gas. the heat capacity of liquid water is very high which means that temperatures do not vary as much over/near ocean areas...mars has no oceans. the oceans act as a giant heat bank and there is a huge ocean-atmosphere interaction on earth, but mars has no ocean. on earth there are several gases that act as greenhouse gases (methane and significant amounts of h2o); mars has meager amounts in comparison. on venus the atmospheric pressure is greater than the pressure of earth's ocean 100 feet down plus the increased solar radiation being close to the sun. In summary, on Venus you have a huge blanket of co2 with pressures... lot's of clouds... and close to the sun. On earth you have an ocean, co2 and methane in the atmosphere. on mars you have just a meager 6 mb atmosphere which can't even maintain water in liquid form.

timespiral

Venus is a much smaller planet, and is SIGNIFICANTLY closer to the sun. Greenhouse gases are simply one factor to consider when figuring out the temperature of any given planetary body. A larger planet would have a thinner atmosphere by scale, and would require more energy to heat.

Jesse C

venus is much nearer to the sun than mars. also i guess venus has much more atmosphere than mars, so even if mars has the same percentage, it certainly has much less carbon dioxid. Edit: looking it up on wiki i saw venus really has much much more atmosphere than mars (even than earth)

Michael

I think but am not sure that the atmospheric pressure on Mars surface is similar to the atmospheric pressure at 100,000 feet above the Earth's surface. There is not enough mass of CO2 on Mars today to make a greenhouse effect. Eons ago that is very probable.

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