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Though not initially part of its proposed objectives, the Cassini/INCA instrument was able to image the heliospheric boundary during the cruise to Saturn. These maps suggest a closed, ‘bubble-like’ shape to the heliosphere, which contrast with the conclusions from the IBEX missions; the issue remains hotly debated in the heliophysics community today. Image credit: NASA/JPL/JHUAPL. (Online version in colour.)
