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I'd like to order some foreign currency and albuterol Heavier isotopes are usually rarer in nature than lighter ones, but Mars is showing a higher ratio than what you would see on Earth. The higher the ratio, the more atmospheric loss that is occurring. "When you look at the physics of how atoms escape from an atmosphere, the lighter atoms can escape a little easier," said Mahaffy. "It's not a big effect, but if the molecules are lost over billions of years, you start to build up more of the heavy isotopes."