Many scientific probes sent to other parts of the solar system are looking for signs of something so far known to exist only on Earth,namely

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Many scientific probes sent to other parts of the solar system are looking for signs of life, as it is a phenomenon that has only been observed on Earth. While elements such as carbon, gold, and nitrogen are present in the universe, they are not unique to Earth and have been observed in other locations.

Many Scientific Probes Sent to Other Parts of the Solar