Through 'comparative planetology" two ESA spacecrafts, Mars Express and Venus Express (clever names), are observing the atmosphers of these planets as they are "stripped" away into space. They are able to look into the evolution of the planets' atmospheres and make comparisons between the two. Apparently these spacecrafts are very good at what they do and so far have found that Venus and Mars are similar planets, despite their size difference. Check it out:
http://www.astronomy.com/asy/default.aspx?c=a&id=6710
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