The vapor surrounding Pluto gleams brightly in an image snapped by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC). Experts believe the halo is a high-altitude haze created by chemical reactions — instigated by the Sun — between nitrogen and methane. These reactions lead to tiny particles called tholins in the atmosphere. The New Horizons' team used software combining data from three images (blue, red and near-infrared) to reproduce what the view in space would look like. [See more images of Pluto and Its Moons.]
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