NASA eyes Venus, bizarre moons Jupiter and Neptune for low-cost space missions

Venus, Jupiter’s supervolcanic moon Io and Neptune’s big satellite Triton are in NASA’s crosshairs.

Those three cosmic objects are the focus of the four finalists for NASA’s next round of Discovery missions. The Discovery Program develops relatively low-cost robotic-exploration efforts; each one is capped at $500 million, excluding costs for the launch vehicle and mission operations.




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