When it comes to the best science return for the space buck, robots are the best investment. These spindly looking robots with antennae and scientific instruments sticking out in all directions are remarkably long-lived. Space scientists are very clever when they ask for funding. NASA's Cassini spacecraft captured images of Saturn's atmosphere never seen before in the first successful flight through the gap between the planet and its famous rings. This graphic illustrates how Cassini scientists think water interacts with rock at the bottom of the ocean of Saturn's icy moon Enceladus, producing hydrogen gas.

Source: CBC News April 28, 2017 20:37 UTC