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Pluto’s heart

Pluto as seen in 2015 by the New Horizons probe.
Pluto as seen in 2015 by the New Horizons probe. Image: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

This iconic image by New Horizons was taken when the probe was about 476,000 miles out. According to a NASA release, this is the last, most detailed image of the dwarf planet sent to Earth before the spacecraft made its closest approach.