The first pictures taken by the Messenger probe as it passed Mercury on Monday have started to arrive at Earth.
They include images that show parts of the surface missed by the Mariner 10 spacecraft when it flew by the planet in the 1970s.
Like the previously mapped portions of Mercury, the new sections appear heavily cratered.
They include images that show parts of the surface missed by the Mariner 10 spacecraft when it flew by the planet in the 1970s.
Like the previously mapped portions of Mercury, the new sections appear heavily cratered.
