Pluto: Past and FutureAmerican astronomer Clyde Tombaugh discovered Pluto, the ninth planet in our solar system, on February 18, 1930. Many key questions about Pluto, it's moon Charon, and the outer fringes of our solar system await close-up observations.Read More Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/pluto-past-future/Copy URL to clipboard> DownloadShareSize1041x833px