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This artist's rendition released by NASA on July 30, 2015 shows one possible appearance for the planet HD 219134b, the nearest rocky exoplanet found to date outside our solar system. The planet is 1.6 times the size of Earth, and whips around its star in just three days. Scientists predict that the scorching-hot planet -- known to be rocky through measurements of its mass and size -- would have a rocky, partially molten surface with geological activity, including possibly volcanoes. AFP PHOTO/NASA/JPL = RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO HANDOUT-NASA-JPL"/ NO MARKETING - NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS=