New Horizons spotted the plume of Io's volcano Tvashtar on Feb. 26, 2007. It appears as an umbrella-shaped feature of the edge of Io's disk in the 11 o'clock position in this long-exposure (20-millisecond) frame. The bright spots at 2 o'clock are high mountains catching the setting sun; beyond them the night side of Io can be seen, faintly illuminated by light reflected from Jupiter itself. Credit: NASA/JHU/APL/SwRI. Click to enlarge.
