New Horizons Edges Toward the Sun’s Outer Boundary
NASA’s New Horizons, waking from a year‑long hibernation 5.9 billion miles from Earth, continues its Kuiper Belt voyage and is aimed at the solar system’s outer boundary. Scientists estimate it will encounter the termination shock—the point where the solar wind slows on its way to interstellar space—between 2029 and 2040, with the heliosphere expanding and contracting over the solar cycle and potentially causing multiple crossings before the craft leaves the solar system.
