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The next breath you take could have come from beyond Pluto. Researchers studying the composition of ancient gases trapped in deep wells in New Mexico have found convincing evidence that some of our planet's atmosphere originated in the far reaches of the solar system. The discovery could change long-standing thinking about how Earth's atmosphere evolved.
Since the 1950s, scientists have thought that as Earth congealed from the primordial cloud of dust and gases that also formed the sun and other planets. A reasonable idea, at least until researchers began collecting samples from the New Mexico wells several years ago. Their original purpose was to study the pristine bubbles of volcanic gases trapped underground for billions of years. These bubbles had never made it to the surface before and therefore remained uncontaminated by the modern atmosphere.
The krypton and xenon isotope ratios in the gas samples provided a surprising result: They did not match the ratios found in the primordial cloud that spawned the solar system. Those ratios persist today in the solar wind and have been measured by satellites. Instead, they matched the ratios contained within certain types of meteorites that formed 4.5 billion years ago at the beginning of the solar system, which have been measured from meteorites that have landed on Earth. The conclusion, the team reports today in Science, is that part of Earth's atmosphere must have arrived after the planet had fully formed--possibly carried by comets that hit the planet and whose ice would have evaporated upon impact, leaving water vapor and traces of krypton, xenon, and other elements in the atmosphere.
Originally posted by sunny_2008ny
We always thought that the earth's atmosphere formed on Earth. Now we have found out that this was not the case and that the atmosphere came from the solar system.
So life on earth which was evolved because of the atmosphere may be because of the atmosphere that came from the solar system. So was life created by such an atmosphere in other reigons of the galaxy?