Pluto and its largest moon, Charon, could be considered a double planet. The balance point between them is between them in space, not within Pluto, so they're orbiting together around a point in space. This is our first mission to a double planet.

Planetary scientist Alan Stern explains why he believes new close-up pictures of Pluto prove beyond doubt that it should have its planet status reinstated. Also, close-up photographs of Pluto!

Margaret Heffernan explains why companies should value — treasure! — whistleblowers, how and why Saturn is turning blue, and other good reads from round the web.