APOD 4.6 (Farther Along)

I chose this image because it literally shows how far we have come in our space age technology.  It shows that some of our oldest probes (Voyager 1, Pioneer 10, Voyager 2, Pioneer 11) are far out there, Voyager 1 farthest out at a distance of 17.5 billion kilometers, or 16 light-hours from the Sun (by comparison, the Earth is 8 light minutes away from the sun), Pioneer 10 close behind at 15.4 billion kilometers, although it is on the opposite side of the solar system from the four other satellites highlighted.  The New Horizons probe, launched a few years ago, should reach Pluto in 2015, which should give us much more data on the dwarf planet when it arrives.