Understanding Pluto’s Icy ‘Heart’

When NASA’s New Horizons mission flew by Pluto last year, it sent back images that recalled a past era – a time when a few photos of initial reconnaissance could drastically change our sense of an entire celestial body. For The Moon and Mars, these initial glimpses happened decades ago; satellites of the gas giants, like Europa, Enceladus, and Titan were ready for their close-ups next. And after that? Well, it seemed as if the geologically active, charistmatic targets in our Solar System wer

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