Solar Wind

Explanation: This figure shows solar wind observations measured by New Horizons from Jan. 1 to Aug. 25, 2015. This measurement of seed particles for anomalous cosmic rays in the solar wind is completely new in this region of space and is key for interpreting Voyager data further out in the interstellar boundary region. Points closer to the top of the graph correspond to higher-energy particles, and red and yellow colors show a larger number of particles hitting the detector. The particle instruments were shut down during certain spacecraft operations and trajectory maneuvers, resulting in brief data gaps.

Pluto

Image credit: NASA/New Horizons/SwRI