Since the 1990s, scientists have been intrigued by unusual radar observations of the closest planet to the sun, Mercury. On Thursday, a large team of scientists announced that the NASA mission, MESSENGER, launched into orbit around the planet in 2004, has found evidence of frozen water and organic material, carbon-based molecules that are the building blocks of life on Earth -- though the researchers emphasized the discovery does not mean there is, or ever was, life on inhospitable Mercury.
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