Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Chemical analyses of interplanetary dust particles similar to this one suggest that some of them may be bits of comets and represent samples of material from the early stages of the formation of the Solar System. In addition to peering into the chemistry and history of the solar system, the composition of cometary dust has important implications for the possibility of past life on Mars .
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