#1




How hot would Venus be without the greenhouse effect?
If Venus didn't have a very thick envelope of carbon dioxide say it had 1 standard atmosphere of nitrogen how hot would it be?

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#2




About as much hotter than Earth as Earth is compared to Mars, is my first guess.

#3




An effective temperature (assuming Venus had an albedo of zero and no atmosphere) can be derived using the StefanBoltzmann law, which is based on the assumption that the planet will absorb all solar radiation incident on it, and rise in temperature until the thermal radiation it emits is enough to dispose of all that power.
Using the derivation that that article uses for the Earth, but with Venus' numbers gives an effective temperature of about 329K (55.9 C). As is noted in the article, there is a downward adjustment for nonzero albedo, and and upward adjustment because of the atmosphere, but that gives a ball park estimate. 
#4




Why is the Venutian atmosphere so dense? The earth is a lalrger mass than Venusand our atmosphere is much thinner. Why hasn't the Venutian atmosphere boiled off to space (and be about the same density as the earth's).

#5




Quote:
If it wasn't for plants eating up the CO2 and pooping out oxygen, our atmosphere would no be much different. 
#6




The answer
About 80 degrees celsius, or 353 degrees Kelvin.
You do this by seeing how many times further away the Earth is from the sun. Then you take that number (1.38251), and multiply it by earth's temperature if it didn't have greenhouse gasses(255k). The answer is 353 degrees kelvin, or 80 degrees celsius. So if you are wondering the greenhouse gasses are responsible for making Venus 384 degrees warmer than it already is...now that is a hot topic 
#7




Venus actually has about the amount of atmosphere you'd expect for its mass and distance from the Sun. The better question is why Earth's (and Mars') atmosphere is so thin.

#8




Quote:
(temperature in Kelvin)^{4} * (radius of the planet)^{2} is inversely proportional to (distance from planet to star)^{2} for planets orbiting around the same star (and with the same albedo). For Venus and the Earth, the sizes of the two planets are about the same, so the temperature in Kelvin on Venus will be inversely proportional to the square root of the distance to the Sun, not the distance itself. Last edited by MikeS; 07132014 at 10:38 AM.. 
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