In 1977, two spacecraft, Voyager 1 and Voyager 2, launched toward the unknown. Nearly fifty years later, they remain alive at the edge of interstellar space, still whispering faint signals back to Earth. That longevity is not due to solar panels or batteries, which would have failed decades ago. Instead, it comes from a small nuclear power source. Plutonium-238 is …
Read More »How a long-life nuclear fuel will transform space travel
