“…Both the atmospheres of Mars and Venus are composed of 95% carbon dioxide, although Venus’s atmosphere is much thicker than the one at Mars. The American team suggested that the signature could be coming from an isotope of carbon dioxide, where one oxygen atom is ‘normal’, with eight protons and eight neutrons, while the other has eight protons and ten neutrons. Such an isotope makes up about 1% of carbon dioxide on Earth; the rest contains two normal oxygen atoms…The different weights of the oxygen atoms allow the molecule to alter its vibration in two ways simultaneously, whereas normal molecules can only change one state at a time.

This rare transition allows it to absorb even more energy and so contribute even more to the greenhouse effect on Venus….” Full Slice

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