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The Venus In-Situ Explorer (VISE) is a mission proposed in the 2000s by the planetary science Decadal Survey to NASA's New Frontiers program as a space probe designed to answer fundamental scientific questions by landing and performing experiments on Venus. Although the mission is no longer listed as a New Frontiers program candidate as of 2014, the Principal Investigators have kept refining and promoting the mission concept.
While on the surface, the Venus In-Situ Explorer will acquire and characterize a core sample of the surface to study pristine rock samples not weathered by the very harsh surface conditions of the planet. Also, the VISE will measure the composition and mineralogy of the surface. The Venus In-Situ Explorer has been proposed for launch in 2013.
Several variant mission concepts for a Venus in-situ explorer have also been proposed, including both surface and atmospheric exploration: