A Blue Monday on Mercury

This latest image from NASA’s MESSENGER spacecraft, now in its extended mission around Mercury, shows a color view of a section of the first planet’s rugged and sun-blasted surface.

Electric Blue

  Yesterday’s Astronomy Picture of the Day was this fantastic image by the talented Alan Friedman, showing the sphere of our Sun taken in a special wavelength of light emitted by hydrogen gas and then inverted to look blue. Incredible details of the Sun’s surface – the chromosphere – become visible, most notably the texture…