Astronomy Picture of the Day . ... Martian Dust Storm . ... If you've been unhappy with the weather on Earth, check out Mars, now in the grip of a planet-wide dust storm. ... In the above composite picture, newly resolved diffuse X-ray emission is shown in blue, superposed on a HST image showing massive stars in red. ... NGC 1977: Blue Reflection Nebula in Orion . ... The above picture captures a part of the Orion Nebula that primarily reflects light from bright Orion stars. ...